Astronomical Calendar 2017

Sun Mon Tue Wed Thu Fri Sat2017Julian Date

at 0 UTbetween months

12457754.5 2 3 4 5 6 78

January9 10 11 12 13 14

15 16 17 18 19 20 2122 23 24 25 26 27 2829 30 31 12457785.5 2 3 45 6 7 8

February9 10 11

12 13 14 15 16 17 1819 20 21 22 23 24 2526 27 28 12457813.5 2 3 45 6 7 8

March9 10 11

12 13 14 15 16 17 1819 20 21 22 23 24 2526 27 28 29 30 31 12457844.5

2 3 4 5 6 7 8April

9 10 11 12 13 14 1516 17 18 19 20 21 2223 24 25 26 27 28 2930 12457874.5 2 3 4 5 67 8

May9 10 11 12 13

14 15 16 17 18 19 2021 22 23 24 25 26 2728 29 30 31 12457905.5 2 34 5 6 7 8

June9 10

11 12 13 14 15 16 1718 19 20 21 22 23 2425 26 27 28 29 30 12457935.5

2 3 4 5 6 7 8July

9 10 11 12 13 14 1516 17 18 19 20 21 2223 24 25 26 27 28 2930 31 12457966.5 2 3 4 56 7 8

August9 10 11 12

13 14 15 16 17 18 1920 21 22 23 24 25 2627 28 29 30 31 12457997.5 23 4 5 6 7 8

September 910 11 12 13 14 15 1617 18 19 20 21 22 2324 25 26 27 28 29 3012458027.5 2 3 4 5 6 78

October 9 10 11 12 13 1415 16 17 18 19 20 2122 23 24 25 26 27 2829 30 31 12458058.5 2 3 45 6 7 8

November 9 10 1112 13 14 15 16 17 1819 20 21 22 23 24 2526 27 28 29 30 12458088.5 23 4 5 6 7 8

December 9

10 11 12 13 14 15 1617 18 19 20 21 22 2324 25 26 27 28 29 3031 12458119.5

Darker blue means less moonlight in the following night.

BLOCK CALENDAR

Astronomical Calendar 2017

-27

-26

-13

-12

-11

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

+1

+2

+3

+4

+5

+6

+7

+8

+9

+10

+11

+12

+13

+14

+15

+16

+17

+18

+19

+20

+23

+24

+25

+26

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

----fi

reb

alls------------------

-1.4 Sirius

-0.7 Canopus ---naked-eye in daytime sky? 0.0 Arcturus, Vega, Capella

1.4 Regulus

2.1 Polaris

3.5 naked-eye limit, in cities

5 ----average conditions

6.5 ----good conditions

8.6 ----through blackened tube 9 2-inch binoc., 1-inch tel.

10.5 2-inch (5-cm) telescope11 Proxima Centauri11.4 3-inch (8-cm) telescope

12.9 6-inch (15-cm)

13.5 8-inch (20-cm)

14.4 12-inch (30-cm)

19.5 200-inch (508-cm), visual

23.5 ----photographic

(28) faintest objects photographed(31) faintest objects recorded with Hubble Space Tel.

Moon

conj

oppPluto

conj

oppNeptune

conj

oppUranus

opp

conjSaturnSaturn without rings

opp

conj

Jupiter

conjMars

sup conj

inf conj

sup conj

inf conj

sup conj

inf conj

Mercury

Mercury

inf conj

Venus

1 Ceres1 Ceres

2 Pallas2 Pallas

3 Juno

3 Juno

4 Vesta

4 Vesta

7 Iris

7 Iris

8 Flora

20 Massalia

20

Massalia

2P Encke

24P Sc

haum

asse

45P

Honda-M

rkos-

Pajd

usako

va

96P Machholz

103P Hartley

29P Schwassmann-

Wachmann 1

95P Chiron

Sun

eclipse

eclipse

eclipse

eclipse

1 8 0 o

1 7 0 o

1 6 0 o

1 5 0 o

1 4 0 o

1 3 0 o

1 2 0 o

1 1 0 o

1 0 0 o

9 0 o

8 0 o

7 0 o

6 0 o

5 0 o

4 0 o

3 0 o

2 0 o

1 0 o

0 o

1 0 o

2 0 o

3 0 o

4 0 o

5 0 o

6 0 o

7 0 o

8 0 o

9 0 o

1 0 0 o

1 1 0 o

1 2 0 o

1 3 0 o

1 4 0 o

1 5 0 o

1 6 0 o

1 7 0 o

1 8 0 o

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

elo

ngatio

n w

est (m

ornin

g sky)

elo

ngatio

n EA

ST (EV

EN

IN

G sky)

Antares

Antares

Spica

Spica

Regu

lus

Regu

lus

Beeh

ive

Beeh

ive

Pollu

x

Pollu

x

Alde

baran

Alde

baran

Pleiad

es

Pleiad

es

Pluto

Pluto

Nep

tune

Nep

tune

Nep

tuneU

ranu

s

Uranu

s

Saturn

Satu

rn

Jupiter

Jupiter

Jupi

ter

Mars

Mars

Mercury

Mercury

Venus

Venus

Sun

Mo

on

eclipse

eclipse

eclipse

eclipse

41P Tuttle-

Giaco

bini-

Kresak

96P

Machholz

Mo

on

Regu

lusBe

ehive

Pollu

x

Alde

baranPl

eiad

es

Uranu

s

ELONGATION

MAGNITUDE

Astronomical Calendar 2017

FAVORABLE TIMES

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2017

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

elo

ngatio

n

Neptune

Neptune

Uranus

Uranus

Saturn

Saturn

Jupite

r

Jupiter

MarsMars

Venus

Venus

MercuryMercury

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2017

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

elo

ngatio

n

1 Ceres

1 Ceres

2 Pallas

2 Pallas

2 Pallas

3 Juno4 Vesta

4 Vesta

7 Iris

7 Iris

7 Iris

8 Flora

8 Flora

20 Massalia

20 Massalia

20 Mass-alia

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2017

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

elo

ngatio

n

C/2015 V2

Johnson

2P Enck

e

2P Enc

ke 2P Encke

24P Schaumasse

41P Tuttle-

Giacobini-Kresak

41P Tuttle-Giacobini-Kresak

45P

Ho

nda-

Mrk

os-

Paj

dusa

kova

45P Honda-Mrkos-

Pajdusakova

96P Machholz

96P Machholz103P Hartley

29P Schwassmann-

Wachm

ann 1

C/2015 V2 Johnson

These graphs show times of the year when moving bodies of the solar system are betterobservable.

For each planet, or relatively bright asteroid or comet, the curve’s height represents elon-gation (angular distance from the Sun). So the top of the curve is at the time of the body’s

opposition (if it has one, the bottom is at the time of conjunction with the Sun. (Elongationmay not quite reach 180° or 0°, because the planet may be north or south of the ecliptic.)

The curve is blue when the elongation is westward—that is, in the morning sky.And the curve’s thickness is proportional to the planet’s magnitude: thicker is brighter.

Planets

Asteroids

Comets