Astronomical Calendar 2017 BLOCK CALENDAR Julian Date 2017 at 0 UT between months Sun Mon Tue Wed Thu Fri Sat 2457754.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 January 22 23 24 25 26 27 28 2457785.5 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 February 19 20 21 22 23 24 25 2457813.5 26 27 28 1 2 3 4 5 6 7 8 9 10 11 ch Mar 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2457844.5 26 27 28 29 30 31 1 l 2 3 4 5 6 7 8 Apri 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 2457874.5 30 1 2 3 4 5 6 7 8 9 10 11 12 13 May 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2457905.5 28 29 30 31 1 2 3 4 5 6 7 8 9 10 June 11 12 13 14 15 16 17 18 19 20 21 22 23 24 2457935.5 25 26 27 28 29 30 1 2 3 4 5 6 7 8 ly Ju 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 2457966.5 30 31 1 2 3 4 5 t 6 7 8 9 10 11 12 Augus 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2457997.5 27 28 29 30 31 1 2 3 4 5 6 7 8 9 ember 10 11 12 13 14 15 16 Sept 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2458027.5 1 2 3 4 5 6 7 r 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Octobe 22 23 24 25 26 27 28 2458058.5 29 30 31 1 2 3 4 5 6 7 8 9 10 11 ember 12 13 14 15 16 17 18 Nov 19 20 21 22 23 24 25 2458088.5 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 December 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2458119.5 31 1 Darker blue means less moonlight in the following night. Astronomical Calendar 2017

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MAGNITUDE -27 Sun -26 eclipse eclipse eclipse eclipse -13 -12 -11 -10 -9 -8 -7 -6 -5 Venus

-4 inf conj ----fireballs------3 opp sup conj Jupiter sup conj -2 sup conj Mer c conj -1.4 Sirius -1 ury cury -0.7 Canopus Mer opp ---naked-eye in daytime sky? 0 Saturn conj 0.0 Arcturus, Vega, Capella Saturn without rings +1 1.4 Regulus +2 Mars conj 2.1 Polaris +3 96P Machholz 2P Encke 3.5 naked-eye limit, in cities +4

+5 inf conj 5 ----average conditions Uranus inf conj opp +6 4 Vest inf conj a conj 7 Iris 6.5 ----good conditions +7 opp +8 1 conj 1 Ceres 8.6 ----through blackened tube +9 20 a 9 2-inch binoc., 1-inch tel. 2 Palla Massali 7 Iris s +10 3 Juno 10.5 2-inch (5-cm) telescope +11 11 Proxima Centauri 20 Massalia 11.4 3-inch (8-cm) telescope 41P T +12 G i 103 Kr a cobi P masse utt Hartley u +13 esak 12.9 6-inch (15-cm) l ni- e 13.5 8-inch (20-cm) - opp Scha P +14 Pluto 4 2 14.4 12-inch (30-cm) conj +15 assmann- +16 Honda 29P Schw Pajdusak 1 Wachmann +17 45P - Mrk P 96 olz +18 ov hh os- 95P Chiron a Mac +19 19.5 200-inch (508-cm), visual +20 +23 23.5 ----photographic +24 +25 (28) faintest objects +26 photographed (31) faintest objects recorded with Hubble Space Tel. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1 8 0 o e 1 7 0 o Pollux Beehiv 1 6 0 o ica 1 5 0 o Regulus Sp Saturn 1 4 0 o Jupiter x 1 3 0 o u tares des n Poll o A une Uranus leia 1 2 0 P ve n o 1 1 0 Nept Beehi o ldebara 1 0 0 Pluto egulus A R 9 0 o

8 0 o Moon 7 0 o 6 0 o 5 0 o Venus 4 0 o Mars 3 0 o Mercu elongation west (morning sky) (morning elongation west o 2 0 ry 1 0 o eclipse 0 o Sun eclipse iter 1 0 o Jup M ercury 2 0 o 3 0 o 4 0 o Venus Neptune Mars 5 0 o 6 0 o 7 0 o 8 0 o 9 0 o ter ve Pleiades us to o Jupi ne 1 0 0 Uranus x Spica tares Plu u Beehi egul n ptu oll R A Saturn e 1 1 0 o P N s Aldebaran u 1 2 0 o

M Uran

1 3 0 o oon 1 4 0 o 1 5 0 o leiades elongation EAST (EVENING sky) P 1 6 0 o n

o ebara 1 7 0 d eclipse eclipse Al 1 8 0 o Astronomical Calendar 2017

FAVORABLE TIMES These graphs show times of the year when moving bodies of the are better (if it has one, the bottom is at the time of conjunction with the Sun. (Elongation observable. may not quite reach 180° or 0°, because the may be north or south of the ecliptic.) For each planet, or relatively bright or , the curve’s height represents elon- The curve is blue when the elongation is westward—that is, in the morning sky. gation (angular distance from the Sun). So the top of the curve is at the time of the body’s And the curve’s thickness is proportional to the planet’s magnitude: thicker is brighter.

Planets 2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 180 170 160 150 140 Uranus 130 ter une i turn t 120 Jup Sa Nep 110 100 Saturn 90 U 80 ranus Jupit 70 er 60

elongation 50 Venus M Mars 40 Ne ars p Ven 30 tune us 20 Mercury Mercury 10 0

Asteroids2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 180 4 Vesta 7 Iris 20 - 170 3 Juno alia 160 150 2 Pallas 140 130 120 110 1 Ce 100 res 90 7 Iris 80 a llas ssali 70 2 Pa 20 Ma 60 2 P 8 Flora elongation 50 all as 4 Vesta 40 20

30 Massalia 8 20 Flor 7 a 1 Ceres 10 Iris 0

Comets 2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 180 170 29P 160 Gia 4 1P Tuttle- Schwass 150 cob W a 2P Enc achm 140 ini P ov mann- 130 5 -Kres ann 4 4 ke 2P Encke 1P 1 120 usak ak 9 6P Tutt 110 jd le-G a C/ Machholz 201 iacob 100 Honda-Mrkos-P 2 45P Hond5 V2 Jo in 90 C/2015 nV i-K hnso hnson resak 80 Jo Pa jdusaka-Mr 70 ov kos a - 60 elongation 50 ncke 40 2P E umasse Scha 30 24P 20 103P H 96P Machholz 10 artley 0