DOCSLIB.ORG

APPENDIX 1 POSITIONS and OTHER INFORMATION of the BRIGHTEST PLANETARY NEBULAE and THEIR CENTRAL STARS Nebula Designation A(1950

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
APPENDIX 1 POSITIONS and OTHER INFORMATION of the BRIGHTEST PLANETARY NEBULAE and THEIR CENTRAL STARS Nebula Designation A(1950 APPENDIX 1 POSITIONS AND OTHER INFORMATION OF THE BRIGHTEST PLANETARY NEBULAE AND THEIR CENTRAL STARS Nebula Designation a(1950.0) 0(1950.0) Radius Ex. log F(H~) 2 h m s ° (arc- Class (erg cm- seconds) sec-I) NGC 40 120 + 9°1 o 10 18 +72 14 35 18.2 2 -10.64 Vy 1-1 118 - 8°1 o 16 02 +53 35 41 3.1 -11.55 Hu 1-1 119 - 6°1 o 25 30 +55 41 20 2.5 6 -11. 73 108 -76°1 o 34 47 -13 58 42 -12.61 NGC 246 118 -74°1 o 44 35 -12 09 03 118.0 8p -10.20 NGC 650-1 130 -10°1 1 39 10 +51 19 23 32.0 8p -10.67 IC 1747 130 + 1 °1 1 53 58 +63 04 42 6.4 6 -11.45 A 6 136 + 4°1 2 54 31 -64 18 10 91. -12.43 IC 289 138 + 2°1 3 06 16 +61 07 39 22.5 10 -11.67 NGC 1360 220 -53°1 3 31 07 -26 02 12 214.0 -10.02 IC 351 159 -15°1 3 44 20 +34 53 35 3.5 8 -11.40 IC 2003 161 -14°1 3 53 12 +33 43 52 3.3 8 -11.18 NGC 1501 144 + 6°1 4 02 42 +60 47 12 27.0 8p -11.26 NGC 1514 165 -15°1 4 06 08 +30 38 42 50.0 -10.95 NGC 1535 206 -40°1 4 11 57 -12 51 42 9.2 7 -10.40 A 7 215 -30°1 5 00 54 -15 40 07 375. J 320 190 -17°1 5 02 49 +10 38 25 3.2 5 -11.37 IC 418 215 -24°1 5 25 10 -12 44 15 6.2 3 - 9.59 NGC 2022 196 -10°1 5 39 22 + 9 03 54 9.85 10 -11.10 M 1-5 184 - 2°1 5 43 46 +24 20 59 1.15 -12.05 IC 2149 166 +10°1 5 52 41 +46 05 53 4.75 4 -10.55 AD 204 - 8°1 6 02 08 + 3 56 42 78. -12.62 IC 2165 221 -12°1 6 19 24 -12 57 40 3.85 9 -10.89 J 900 194 + 2°1 6 23 02 +17 49 15 5.5 7 -11.27 K 2-2 204 + 4°1 6 49 45 +10 01 44 207. -11.12 NGC 2346 215 + 3°1 7 06 49 - 0 43 29 27.3 7 -11.33 : NGC2371-2 189 +19°1 7 22 25 +29 35 26 27.0 9p -10.96 NGC 2392 197 +17°1 7 26 13 +21 00 56 23.0 8p -10.39 A 21 205 +14 °1 7 26 15 +13 20 44 319. -10.4 NGC 2438 231 + 4°2 7 39 32 -14 36 56 34.0 -10.97 NGC 2440 234 + 2°1 7 39 41 -18 05 26 16.2 9 -10.45 NGC 2452 243 - 1°1 7 45 25 -27 12 43 9.8 7 -11. 54 A 24 217 +14°1 7 48 59 - 3 08 00 178. -11.35 NGC 2474 164 +31°1 7 53 60 +53 33 24 194. -11.26 A 30 208 +33°1 8 44 04 +18 03 35 64. -12.19 294 295 APPENDIX I Sv EB- V ne , Te mv Spectral Expans. Vrad (6 cm) type Ve1oc. (LSR) Sv/H~ ",2200 Balmer X10- 3 10-4 mJy Decr. cm-3 K km s-1 km s-1 460 0.58 0.38 .44 1.3 0.85 11.65 WC8 29 -13. 28 0.32 2.0 1.2 14.45 10 -47. .25 2.3 1.1 16.5 15 -46. .1 1.9 1.2 +191. 247 0.0 0.02 0.0 0.09 11.95 OVI 38 -46. 125 0.10 .09 0.56 1.2 17. Cont. 42? -23. 124 0.72 .62 3.8 1.0 15.4: OVI, WC4 30 -59. 1.0 19. 170 0.90 16.8: Cont. 22 -10. 600 0.05 0.05 1.8 11.35 sdO 28 +33. 33 0.24 0.10 .19 3.5 1.2 15.4 Cont. 20 -14. 43 0.19: .12 6.7 120 16.5 OVI, WC 24 -21. 210 0.74 14.14 OVI, WC4 39 +32. 300 0.56 0.50 0.3 1.4 9.42 AOIII 25 +48. 160 0.05 0.04 .08 4.2 1.1 12.22 0 20 -20. 305 15.43 sdO, WD -1. 31 0.22 0.13 .21 8.7 1.2 14.4: 17 -38. 1550 0.22 0.19 .18 14.0 0.85 9.93 Of 12 +43. 91 0.26 .26 1.4 1.4 14.9 Cont. 29 -1. 80 28.0 1.1 +26. 280 0.34 0.28 .19 4.0 1.05 11.6 07f 21 -34. 7 0.66 17.87 188 0.38 .42 5.0 1.3 18.5: 20 +35. 110 0.48 .57 7.0 1.15 16.3: 18 +33. 54 0.18 0.0: 18.2 86: 0.45: 0.22 .17 0.4 1.3 11.12 A5V +10. 87 0.17 0.03 .07 1.3 1.45 14.76 OVI, WC3 42? +11. 251 0.14 0.08 .10 3.4 1.3 10.43 07f 54 +64. 387 0.17 0.0 15.99 Cont. 32 +12. 83 0.25 .14 17.7 Cont. +59. 410 0.30 2.5 1.4 19. : 23 +45. 57 0.49 .35 2.0 1.2 18. : OVI, WC3 +50. 80 0.41 .32 17.18 14 -1. 0.0 16.0 35 -83. 0.0 14.30 OVI 40 296 APPENDIX I Nebula Designation a{1950.0) 6{1950.0) Radius Ex. log F{HJ3) 2 hm s ° {arc- Class (erg cm- seconds) sec-1) A 31 219 +31°1 8 51 32 + 9 05 25 486. -10.54 A 33 238 +34°1 9 36 37 - 2 34 57 134. -11.3 IC 2448 285 -14°1 9 06 37 -69 44 07 4.65 7 -10.85 NGC 2792 265 + 4°1 9 10 34 -42 13 08 6.5 8 -11.23 NGC 2818 261 + 8°1 9 13 59 -36 24 58 25. 9 -11.40 NGC 2867 278 - 5°1 9 20 01 -58 05 51 7.6 7 -10.58 A 34 248 +29°1 9 43 10 -12 56 22 137. -11.84 NGC 3132 272 +12°1 10 04 55 -40 11 29 (28) 6p -10.43 NGC 3211 286 - 4°1 10 16 12 -62 25 06 8.0 9 -11.06 NGC 3242 261 +32°1 10 22 21 -18 23 23 (20) 7 - 9.83 NGC 3587 148 +57°1 11 11 54 +55 17 101.0 -10.49 K 1-22 283 +25°1 11 24 18 -34 05 44 91. -11.42 NGC 3918 294 + 4°1 11 47 50 -56 54 10 7.7 7 -10.04 NGC 4361 294 +43°1 12 21 55 -18 30 32 40. 10+ -10.60 IC 3568 123 +34°1 12 31 47 +82 50 22 6.0 5 -10.77 A 35 303 +40°1 12 51 00 -22 35 30 400. -11.3 H 4-1 49 -88°1 12 57 03 +27 54 24 1.35 -12.70 NGC 5189 307 - 3°1 13 29 59 -65 43 06 70.0 6p -10.87 A 36 318 +41°1 13 37 57 -19 37 43 196. -10.86 NGC 5315 309 - 4°2 13 50 13 -66 16 06 3.05 6 -10.42 NGC 5882 327 +10°1 15 13 25 -45 27 56 7.2 6 -10.38 Me 2-1 342 +27°1 15 19 23 -23 26 52 2.3 9.5 -11.32 He 2-131 315 -13°1 15 31 54 -71 45 00 3.0 2 -10.17 NGC 6058 64 +48°1 16 02 42 +40 49 13.0 -11.77 IC 4593 25 +40°1 16 09 23 +12 12 08 6.0 4 -10.55 NGC 6072 342 +10°1 16 09 42 -36 06 01 35.0 -11.37 NGC 6153 341 + 5°1 16 28 05 -40 08 58 11.7 6 -10.85 NGC 6210 43 +37°1 16 42 24 +23 53 29 8.5 5 -10.08 IC 4634 o +12°1 16 58 35 -21 45 28 4.5 5 -10.88 NGC 6302 349 + 1°1 17 10 21 -37 02 38 22.3 10+ -10.53 NGC 6309 9 +14 °1 17 11 15 -12 51 11 6.9 8 -11.25 NGC 6326 338 - 8°1 17 16 49 -51 42 20 5.9 6.5 -11.09 NGC 6369 2 + 5°1 17 26 18 -23 43 12 14.3 5 -11.30 NGC 6439 11 + 5°1 17 45 26 -16 27 44 2.6 -11.59 NGC 6445 8 + 3°1 17 46 17 -19 59 41 16.6 8 -11.15 APPENDIX I 297 Sv EB- V ne Te mv Spectral Expans. Vrad (6 em) type Veloc. (LSR) Sv/H~ A.2200 Balmer XlO- 3 10-4 mJy Deer. em- 3 K km s-1 km s-1 0.0 15.51 sdO 35 0.0 0.0 0.1 1.0 14.74 sdO 32 +49.
Load more

Recommended publications
  • Filter Performance Comparisons for Some Common Nebulae
    Filter Performance Comparisons For Some Common Nebulae By Dave Knisely Light Pollution and various “nebula” filters have been around since the late 1970’s, and amateurs have been using them ever since to bring out detail (and even some objects) which were difficult to impossible to see before in modest apertures. When I started using them in the early 1980’s, specific information about which filter might work on a given object (or even whether certain filters were useful at all) was often hard to come by. Even those accounts that were available often had incomplete or inaccurate information. Getting some observational experience with the Lumicon line of filters helped, but there were still some unanswered questions. I wondered how the various filters would rank on- average against each other for a large number of objects, and whether there was a “best overall” filter. In particular, I also wondered if the much-maligned H-Beta filter was useful on more objects than the two or three targets most often mentioned in publications. In the summer of 1999, I decided to begin some more comprehensive observations to try and answer these questions and determine how to best use these filters overall. I formulated a basic survey covering a moderate number of emission and planetary nebulae to obtain some statistics on filter performance to try to address the following questions: 1. How do the various filter types compare as to what (on average) they show on a given nebula? 2. Is there one overall “best” nebula filter which will work on the largest number of objects? 3.
    [Show full text]
  • Messier Objects
    Messier Objects From the Stocker Astroscience Center at Florida International University Miami Florida The Messier Project Main contributors: • Daniel Puentes • Steven Revesz • Bobby Martinez Charles Messier • Gabriel Salazar • Riya Gandhi • Dr. James Webb – Director, Stocker Astroscience center • All images reduced and combined using MIRA image processing software. (Mirametrics) What are Messier Objects? • Messier objects are a list of astronomical sources compiled by Charles Messier, an 18th and early 19th century astronomer. He created a list of distracting objects to avoid while comet hunting. This list now contains over 110 objects, many of which are the most famous astronomical bodies known. The list contains planetary nebula, star clusters, and other galaxies. - Bobby Martinez The Telescope The telescope used to take these images is an Astronomical Consultants and Equipment (ACE) 24- inch (0.61-meter) Ritchey-Chretien reflecting telescope. It has a focal ratio of F6.2 and is supported on a structure independent of the building that houses it. It is equipped with a Finger Lakes 1kx1k CCD camera cooled to -30o C at the Cassegrain focus. It is equipped with dual filter wheels, the first containing UBVRI scientific filters and the second RGBL color filters. Messier 1 Found 6,500 light years away in the constellation of Taurus, the Crab Nebula (known as M1) is a supernova remnant. The original supernova that formed the crab nebula was observed by Chinese, Japanese and Arab astronomers in 1054 AD as an incredibly bright “Guest star” which was visible for over twenty-two months. The supernova that produced the Crab Nebula is thought to have been an evolved star roughly ten times more massive than the Sun.
    [Show full text]
  • April 2020 Page 1 of 11
    Pretoria Centre ASSA April 2020 Page 1 of 11 NEWSLETTER APRIL 2020 Dear member In the light of the current situation and based upon advice from a virologist at one of the leading pathology laboratories, we regret to have to cancel the March and April viewing evenings and meetings of the Pretoria Centre of ASSA. The situation will be reviewed in time for the May activities and members will be informed of any changes. This decision was not taken lightly, but we believe the health of our members is important and we would not like to be the reason one of our members should fall victim to the virus. We apologize for the inconvenience and trust the skies will be clear wherever you wish to spend time under the stars. Bosman Olivier Chairman TABLE OF CONTENTS Astronomy-related articles on the Internet 2 Astronomy basics: Galaxies 3 Feature of the month: Biggest explosion seen since the Big Bang 3 Astronomy-related images and video clips on the Internet 3 Astronomy basics: Galaxies 3 Observing: A different star cluster - by Magda Streicher 4 NOTICE BOARD 5 Pretoria Centre committee 5 Open Star Clusters with Superimposed Planetary Nebulae: 6 M46/NGC 2438 and NGC 2818/2818A Pretoria Centre ASSA April 2020 Page 2 of 11 Astronomy-related articles on the Internet Is bright Comet ATLAS disintegrating? https://earthsky.org/space/how-to-see-bright- comet-c-2019-y4-atlas?utm_source=EarthSky+News&utm_campaign=11f7198ca6- EMAIL_CAMPAIGN_2018_02_02_COPY_01&utm_medium=email&utm_term=0_c64394 5d79-11f7198ca6-394671529 Meet the giant exoplanet where it rains iron. The temperatures on the day side of giant exoplanet WASP-76b are scorching, high enough for metals to be vapourized.
    [Show full text]
  • Messier Plus Marathon Text
    Messier Plus Marathon Object List by Wally Brown & Bob Buckner with additional objects by Mike Roos Object Data - Saguaro Astronomy Club Score is most numbered objects in a single night. Tiebreaker is count of un-numbered objects Observer Name Date Address Marathon Obects __________ Tiebreaker Objects ________ SEQ OBJECT TYPE CON R.A. DEC. RISE TRANSIT SET MAG SIZE NOTES TIME M 53 GLOCL COM 1312.9 +1810 7:21 14:17 21:12 7.7 13.0' NGC 5024, !B,vC,iR,vvmbM,st 12.. NGC 5272, !!,eB,vL,vsmbM,st 11.., Lord Rosse-sev dark 1 M 3 GLOCL CVN 1342.2 +2822 7:11 14:46 22:20 6.3 18.0' marks within 5' of center 2 M 5 GLOCL SER 1518.5 +0205 10:17 16:22 22:27 5.7 23.0' NGC 5904, !!,vB,L,eCM,eRi, st mags 11...;superb cluster M 94 GALXY CVN 1250.9 +4107 5:12 13:55 22:37 8.1 14.4'x12.1' NGC 4736, vB,L,iR,vsvmbM,BN,r NGC 6121, Cl,8 or 10 B* in line,rrr, Look for central bar M 4 GLOCL SCO 1623.6 -2631 12:56 17:27 21:58 5.4 36.0' structure M 80 GLOCL SCO 1617.0 -2258 12:36 17:21 22:06 7.3 10.0' NGC 6093, st 14..., Extremely rich and compressed M 62 GLOCL OPH 1701.2 -3006 13:49 18:05 22:21 6.4 15.0' NGC 6266, vB,L,gmbM,rrr, Asymmetrical M 19 GLOCL OPH 1702.6 -2615 13:34 18:06 22:38 6.8 17.0' NGC 6273, vB,L,R,vCM,rrr, One of the most oblate GC 3 M 107 GLOCL OPH 1632.5 -1303 12:17 17:36 22:55 7.8 13.0' NGC 6171, L,vRi,vmC,R,rrr, H VI 40 M 106 GALXY CVN 1218.9 +4718 3:46 13:23 22:59 8.3 18.6'x7.2' NGC 4258, !,vB,vL,vmE0,sbMBN, H V 43 M 63 GALXY CVN 1315.8 +4201 5:31 14:19 23:08 8.5 12.6'x7.2' NGC 5055, BN, vsvB stell.
    [Show full text]
  • Planetary Nebulae
    Planetary Nebulae A planetary nebula is a kind of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from old red giant stars late in their lives. The term "planetary nebula" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years. The mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled by strong stellar winds. Eventually, after most of the red giant's atmosphere is dissipated, the exposed hot, luminous core emits ultraviolet radiation to ionize the ejected outer layers of the star. Absorbed ultraviolet light energizes the shell of nebulous gas around the central star, appearing as a bright colored planetary nebula at several discrete visible wavelengths. Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and neon), have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances. In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies.
    [Show full text]
  • SEPTEMBER 2014 OT H E D Ebn V E R S E R V ESEPTEMBERR 2014
    THE DENVER OBSERVER SEPTEMBER 2014 OT h e D eBn v e r S E R V ESEPTEMBERR 2014 FROM THE INSIDE LOOKING OUT Calendar Taken on July 25th in San Luis State Park near the Great Sand Dunes in Colorado, Jeff made this image of the Milky Way during an overnight camping stop on the way to Santa Fe, NM. It was taken with a Canon 2............................. First quarter moon 60D camera, an EFS 15-85 lens, using an iOptron SkyTracker. It is a single frame, with no stacking or dark/ 8.......................................... Full moon bias frames, at ISO 1600 for two minutes. Visible in this south-facing photograph is Sagittarius, and the 14............ Aldebaran 1.4˚ south of moon Dark Horse Nebula inside of the Milky Way. He processed the image in Adobe Lightroom. Image © Jeff Tropeano 15............................ Last quarter moon 22........................... Autumnal Equinox 24........................................ New moon Inside the Observer SEPTEMBER SKIES by Dennis Cochran ygnus the Swan dives onto center stage this other famous deep-sky object is the Veil Nebula, President’s Message....................... 2 C month, almost overhead. Leading the descent also known as the Cygnus Loop, a supernova rem- is the nose of the swan, the star known as nant so large that its separate arcs were known Society Directory.......................... 2 Albireo, a beautiful multi-colored double. One and named before it was found to be one wide Schedule of Events......................... 2 wonders if Albireo has any planets from which to wisp that came out of a single star. The Veil is see the pair up-close.
    [Show full text]
  • Feb BACK BAY 2019
    Feb BACK BAY 2019 The official newsletter of the Back Bay Amateur Astronomers CONTENTS COMING UP Gamma Burst 2 Feb 7 BBAA Meeting Eclipse Collage 3 7:30-9PM TCC, Virginia Beach NSN Article 6 Heart Nebula 7 Feb 8 Silent Sky Club meeting 10 10-11PM Little Theatre of VB Winter DSOs 11 Contact info 16 Feb 8 Cornwatch Photo by Chuck Jagow Canon 60Da, various exposures, iOptron mount with an Orion 80ED Calendar 17 dusk-dawn The best 9 out of 3465 images taken from about 10:00 PM on the 20th Cornland Park through 2:20 AM on the 21st. Unprocessed images (only cropped). Feb 14 Garden Stars 7-8:30PM LOOKING UP! a message from the president Norfolk Botanical Gardens This month’s most talked about astronomy event has to be the total lunar Feb 16 Saturday Sun-day eclipse. The BBAA participated by supporting the Watch Party at the 10AM-1PM Chesapeake Planetarium. Anyone in attendance will tell you it was COLD, but Elizabeth River Park manageable if you wore layers, utilized the planetarium where Dr. Robert Hitt seemed to have the thermostat set to 100 degrees, and drank copious amounts Feb 23 Skywatch of the hot coffee that Kent Blackwell brewed in the back office. 6PM-10PM The event had a huge following on Facebook but with the cold Northwest River Park temperatures, we weren’t sure how many would come out. By Kent’s estimate there were between 100–200 people in attendance. Many club members set up telescopes, as well as a few members of the public too.
    [Show full text]
  • Ghost Hunt Challenge 2020
    Virtual Ghost Hunt Challenge 10/21 /2020 (Sorry we can meet in person this year or give out awards but try doing this challenge on your own.) Participant’s Name _________________________ Categories for the competition: Manual Telescope Electronically Aided Telescope Binocular Astrophotography (best photo) (if you expect to compete in more than one category please fill-out a sheet for each) ** There are four objects on this list that may be beyond the reach of beginning astronomers or basic telescopes. Therefore, we have marked these objects with an * and provided alternate replacements for you just below the designated entry. We will use the primary objects to break a tie if that’s needed. Page 1 TAS Ghost Hunt Challenge - Page 2 Time # Designation Type Con. RA Dec. Mag. Size Common Name Observed Facing West – 7:30 8:30 p.m. 1 M17 EN Sgr 18h21’ -16˚11’ 6.0 40’x30’ Omega Nebula 2 M16 EN Ser 18h19’ -13˚47 6.0 17’ by 14’ Ghost Puppet Nebula 3 M10 GC Oph 16h58’ -04˚08’ 6.6 20’ 4 M12 GC Oph 16h48’ -01˚59’ 6.7 16’ 5 M51 Gal CVn 13h30’ 47h05’’ 8.0 13.8’x11.8’ Whirlpool Facing West - 8:30 – 9:00 p.m. 6 M101 GAL UMa 14h03’ 54˚15’ 7.9 24x22.9’ 7 NGC 6572 PN Oph 18h12’ 06˚51’ 7.3 16”x13” Emerald Eye 8 NGC 6426 GC Oph 17h46’ 03˚10’ 11.0 4.2’ 9 NGC 6633 OC Oph 18h28’ 06˚31’ 4.6 20’ Tweedledum 10 IC 4756 OC Ser 18h40’ 05˚28” 4.6 39’ Tweedledee 11 M26 OC Sct 18h46’ -09˚22’ 8.0 7.0’ 12 NGC 6712 GC Sct 18h54’ -08˚41’ 8.1 9.8’ 13 M13 GC Her 16h42’ 36˚25’ 5.8 20’ Great Hercules Cluster 14 NGC 6709 OC Aql 18h52’ 10˚21’ 6.7 14’ Flying Unicorn 15 M71 GC Sge 19h55’ 18˚50’ 8.2 7’ 16 M27 PN Vul 20h00’ 22˚43’ 7.3 8’x6’ Dumbbell Nebula 17 M56 GC Lyr 19h17’ 30˚13 8.3 9’ 18 M57 PN Lyr 18h54’ 33˚03’ 8.8 1.4’x1.1’ Ring Nebula 19 M92 GC Her 17h18’ 43˚07’ 6.44 14’ 20 M72 GC Aqr 20h54’ -12˚32’ 9.2 6’ Facing West - 9 – 10 p.m.
    [Show full text]
  • Astronomy Magazine Special Issue
    γ ι ζ γ δ α κ β κ ε γ β ρ ε ζ υ α φ ψ ω χ α π χ φ γ ω ο ι δ κ α ξ υ λ τ μ β α σ θ ε β σ δ γ ψ λ ω σ η ν θ Aι must-have for all stargazers η δ μ NEW EDITION! ζ λ β ε η κ NGC 6664 NGC 6539 ε τ μ NGC 6712 α υ δ ζ M26 ν NGC 6649 ψ Struve 2325 ζ ξ ATLAS χ α NGC 6604 ξ ο ν ν SCUTUM M16 of the γ SERP β NGC 6605 γ V450 ξ η υ η NGC 6645 M17 φ θ M18 ζ ρ ρ1 π Barnard 92 ο χ σ M25 M24 STARS M23 ν β κ All-in-one introduction ALL NEW MAPS WITH: to the night sky 42,000 more stars (87,000 plotted down to magnitude 8.5) AND 150+ more deep-sky objects (more than 1,200 total) The Eagle Nebula (M16) combines a dark nebula and a star cluster. In 100+ this intense region of star formation, “pillars” form at the boundaries spectacular between hot and cold gas. You’ll find this object on Map 14, a celestial portion of which lies above. photos PLUS: How to observe star clusters, nebulae, and galaxies AS2-CV0610.indd 1 6/10/10 4:17 PM NEW EDITION! AtlAs Tour the night sky of the The staff of Astronomy magazine decided to This atlas presents produce its first star atlas in 2006.
    [Show full text]
  • A Basic Requirement for Studying the Heavens Is Determining Where In
    Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun­ damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short).
    [Show full text]
  • Spitzer Observations of Planetary Nebulae
    Planetary Nebulae: An Eye to the Future Proceedings IAU Symposium No. 283, 2011 c 2011 International Astronomical Union A. Manchado, L. Stanghellini, & D. Sch¨onberner, eds. DOI: 00.0000/X000000000000000X Spitzer Observations of Planetary Nebulae You-Hua Chu Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, Illinois, 61801, USA email: [email protected] Abstract. The Spitzer Space Telescope has three science instruments (IRAC, MIPS, and IRS) that can take images at 3.6, 4.5, 5.8, 8.0, 24, 70, and 160 µm, spectra over 5–38 µm, and spectral energy distribution over 52–100 µm. The Spitzer archive contains targeted imaging observations for more than 100 PNe. Spitzer legacy surveys, particularly the GLIMPSE survey of the Galactic plane, contain additional serendipitous imaging observations of PNe. Spitzer imaging and spectroscopic observations of PNe allow us to investigate atomic/molecular line emission and dust continuum from the nebulae as well as circumstellar dust disks around the central stars. Highlights of Spitzer observations of PNe are reviewed in this paper. 1. Spitzer Space Telescope The Spitzer Space Telescope (Werner et al. 2004), one of the four NASA’s Great Observatories, is a 0.85 meter diameter, f/12 infrared (IR) telescope launched on August 25, 2003. It has an Earth-trailing heliocentric orbit so that the telescope is kept away from the Earth’s heat and can be cooled more efficiently. Spitzer has three science instruments: (1) The Infrared Array Camera (IRAC; Fazio et al. 2004) has four detectors that take images at 3.6, 4.5, 5.8, and 8.0 µm, respectively.
    [Show full text]
  • The Agb Newsletter
    THE AGB NEWSLETTER An electronic publication dedicated to Asymptotic Giant Branch stars and related phenomena Official publication of the IAU Working Group on Abundances in Red Giants No. 165 — 1 April 2011 http://www.astro.keele.ac.uk/AGBnews Editors: Jacco van Loon and Albert Zijlstra Editorial Dear Colleagues, It is our pleasure to present you the 165th issue of the AGB Newsletter. Lots of nucleosynthesis work, pulsating stars, binaries, and AGB stars in stellar systems from globulars and the Bulge to Local Group galaxies and farther afield. Congratulations to Val´erio Ribeiro, who has just obtained his Philospher’s Degree. It’s great then to see that there are opportunitites for postdoctoral research, such as the one advertised by the group in Uppsala. Don’t miss the announcement of the very interesting workshop in wonderful Warsaw this Summer. Stefan Uttenthaler, back in Vienna, offered the following reaction to last month’s Food for Thought: ”Certainly, the PN population will not be fully representative of the underlying AGB population. Most likely not every AGB star will evolve into a PN, and also the binarity properties (incl. planets) of the population will have an impact on the evolution from the AGB to the PN phase. In fact, just in the previous issue of the Newsletter, De Marco & Soker note that the presence of a companion will alter the PN life time, and that only one quarter of all AGB stars will make a PN. Now concerning the Bulge my opinion is that in the absence of evidence that the PNe are not representative for the underlying AGB population (i.e.
    [Show full text]