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Occultation Newsletter Volume 8, Number 4 Volume 11, Number 2 April 2004 $5.00 North Am./$6.25 Other Profile of (498) Tokio International Occultation Timing Association, Inc. (IOTA) In this Issue Articles Page Analysis of a Lysistrata "Blink". 4 The Probable Detection of a Moon of Asteroid 1024 Hale . 5 A Note About January 2005 Occultation Events in North America . .. 5 A Statistical Method To Differentiate An Occultation Blink From Atmospheric Scintillation When Recording On Videotape . 6 The Probable Detection of a Moon of Asteroid 98 Ianthe . .. 8 Publication Schedule of the Occultation Newsletter in 2005 . 8 Resources Page What to Send to Whom . 3 Membership and Subscription Information . 3 IOTA Publications. 3 The Offices and Officers of IOTA . 9 IOTA European Section (IOTA/ES) . 9 IOTA on the World Wide Web. Back Cover IOTA’s Telephone Network . Back Cover ON THE COVER: Profile of (498) Tokio Profile derived from data acquired during the 2004 February 17 (UT) occultation of 7.3-mag. SAO 119951 by (498) Tokio observed from 24 locations in Japan; it was the best-observed asteroidal occultation of 2004. This profile can be found on the WWW at: http://uchukan.satsumasendai.jp/data/occult/0402tokio.html. Data reduction by Tsutomu Hayamizu of Sendai-uchukan. Publication Date for this issue: December 2004 Please note: The date shown on the cover is for subscription purposes only and does not reflect the actual publication date. The next issue, Volume 11, Number 3 will be published in mid January. Please send submissions for that issue to [email protected] no later than 12 January 2005. 2 Occultation Newsletter, Volume 11, Number 2, April 2004 International Occultation Timing Association, Inc. (IOTA) What to Send to Whom Membership and Subscription Information Send new and renewal memberships and subscriptions, back All payments made to IOTA must be in United States issue requests, address changes, email address changes, graze funds and drawn on a US bank, or by credit card charge to prediction requests, reimbursement requests, special requests, VISA or MasterCard. If you use VISA or MasterCard, and other IOTA business, but not observation reports, to: include your account number, expiration date, and signature. Art Lucas (Do not send credit card information through e-mail. It is Secretary & Treasurer neither secure nor safe to do so.) Make all payments to IOTA 5403 Bluebird Trail and send them to the Secretary & Treasurer at the address on Stillwater, OK 74074 USA the left. Memberships and subscriptions may be made for one Email: [email protected] or two years, only. Send ON articles and editorial matters (in electronic form) to: Occultation Newsletter subscriptions (1 year = 4 issues) John A. Graves, Editor for Occultation Newsletter, are US$20.00 per year for USA, Canada, and Mexico; and 3120 Hydes Ferry Road US$25.00 per year for all others. Single issues, including Nashville, TN 37218-3133 USA back issues, are 1/4 of the subscription price. Email: [email protected] Memberships include the Occultation Newsletter and annual Send Lunar Grazing Occultation reports to: predictions and supplements. Memberships are US$30.00 per Dr. Mitsuru Sôma year for USA, Canada, and Mexico; and US$35.00 per year V.P. for Grazing Occultation Services for all others. Observers from Europe and the British Isles National Astronomical Observatory should join the European Service (IOTA/ES). See the inside Osawa-2, Mitaka-shi back cover for more information. Tokyo 181-8588, Japan Email: [email protected] IOTA Publications Although the following are included in membership, Send interesting stories of lunar grazing occultations to: nonmembers will be charged for: Richard P. Wilds Local Circumstances for Appulses of Solar System 2541 SW Beverly Court Objects with Stars predictions US$1.00 Topeka, Kansas 66611-1114 USA Graze Limit and Profile predictions US$1.50 per graze. Email: [email protected] Papers explaining the use of the above predictions US$2.50 Send Total Occultation and copies of Lunar Grazing IOTA Observer’s Manual US$5.00 Occultation reports to: International Lunar Occultation Centre (ILOC) Asteroidal Occultation Supplements will be available for Geodesy and Geophysics Division US$2.50 from the following regional coordinators: Hydrographic Department South America--Orlando A. Naranjo; Universidad de los Tsukiji-5, Chuo-ku Andes; Dept. de Fisica; Mérida, Venezuela Tokyo, 104-0045 Japan Europe--Roland Boninsegna; Rue de Mariembourg, 33; Email: [email protected] B-6381 DOURBES; Belgium or IOTA/ES (see back cover) Send Asteroidal Appulse and Asteroidal Occultation Southern Africa--Brain Fraser - [email protected] reports to: Australia and New Zealand--Graham Blow; P.O. Box Jan Manek 2241; Wellington, New Zealand IOTA V.P. for Planetary Occultation Services Japan--Toshiro Hirose; 1-13 Shimomaruko 1-chome; Stefanik Observatory Ota-ku, Tokyo 146, Japan Petrin 205 All other areas-Jan Manek; (see address at left) 118 46 Praha 1 Czech Republic ON Publication Information Email: [email protected] Occultation Newsletter (ISSN 0737-6766) is published quarterly by the International Occultation Timing Send observations of occultations that indicate stellar Association, Inc. (IOTA), 5403 Bluebird Trail, Stillwater, duplicity to: OK 74074, USA. IOTA is a tax-exempt organization under Henk Bulder sections 501(c)(3) and 509(a)(2) of the Internal Revenue Noorderstraat 10E Code USA, and is incorporated in the state of Texas. First NL-9524 PD Buinerveen class postage paid at Stillwater, OK, USA. Printing by Tony The Netherlands Murray of Georgetown, GA, USA. Circulation: 400 Email: [email protected] Occultation Newsletter, Volume 11, Number 2, April 2004 3 International Occultation Timing Association, Inc. (IOTA) Analysis of a Lysistrata "Blink" Pixelsmart frame grabber. The several hundred images were titled and arranged for automatic analysis. An Robert L. Sandy analysis program was written in Microsoft QuickBasic 4.5. The advantage of operating in this mode was that it provided for flexible "what if" of the result. I was informed by e-mail on 11/17/03 about a possible The final analysis was done by placing a box around the occultation of the 6.6-mag, target star, SAO 144313 (Spectral star, finding its peak pixel in the box, shifting the box so Class K5--Orange) by the faint, and very fast-moving 15th-mag. that the peak pixel was in the center and summing the asteroid Lysistrata. The occultation was predicted to occur at pixels in the box. A ring of pixels around the box was about 2:20 on 11/19/03 UTC, or 8:20 p.m. CST on the evening used to subtract background signal. of the 18th. This was a very favorable time for my home location at 94d 20m 42.3s west longitude and 39d 01m 40.2s The value of the average brightness was recorded along north latitude. Also the predictions showed that the target with the peak brightness and the x,y location of the peak. star/asteroid would be at an altitude of 23-degrees at azimuth This provided some evaluation of the stability of the 240-degrees for my location. The 28% waning phase moon "seeing" as the peak moved about in the turbulent air. would not even have to be considered, since it would not rise till Typically, the peak pixel moved by as much as 5 pixels. 2:a.m. the next morning. The motion was relatively slow. It seemed to have a period of approximately one second which would seem to The predictions supplied by Steve Preston indicated that I would be explicable in terms of air turbulence. The motion in be near the extreme southern edge of the path. Also, very the x-direction was similar to that in the y-direction noteworthy, the Preston predictions showed that Lysistrata was indicating that the motion was not correlated with "really moving out" at a shadow speed of one second of time per electronic interference. degree of longitude across the earth's surface in the direction southwest to northeast. About a month before this event, I decided to purchase a twice used Celestron 8", f/10 GPS Nexstar SCT. I found that the target 50 star was on the Nexstar's menu of SAO numbered stars, --how 45 good could it get? s 40 s e 35 n t Now another noteworthy item is that I came very close to h 30 ig moving straight east to a high hill instead of staying here at home r 25 in a mobile home park, since I had thought that the target star e B 20 might be behind a tree to the southwest during the occultation ag 15 period. I'm very glad I did not, since, if I had, I most likely ver 10 A would have had a miss. 5 0 I observed using the 8-inch, f:10, Celestron Nexstar and recorded 28 29 30 31 32 33 with the PC23C camera. WWV was recorded on the audio Time, sec, after 0220 UT channel. I thought I saw a "blink" at one time and commented so on the audio recording. On replay and single step I observed what I thought was a single frame occultation. Figure 1: Brightness data during the blink On the same occasion Walt Robinson reported a 1.1 second occultation. Walt's location is about 2 miles north and 38 miles Figure 1 shows the data in a 5 second range about the west of mine. That seemed consistent with a path generally a bit identified "blink". A clear event is shown near 31 north of his location and the 24 km diameter of the asteroid. seconds. These several seconds of data provide assurance Intrigued by the "blink", Art Lucas volunteered to try to do a that the data are real and not just a statistical anomaly.
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