Sky & Telescope - March 2023 - 49

12h 40m
12h 35m
4651
5
6
7
8
9
10
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
Mar
1
4639
M90
VIRGO
4438
M86
pPositions are shown for 0h UT.
center, at roughly 11 p.m. EDT).
The last of these encounters may
be the most compelling. Not only is
M100 bright, but it's also large, presenting
an apparent size of 7.5′ by 6.1′. For
several hours centered on the time of
closest approach (about 10 p.m. EDT),
Ceres will hover directly over one of the
galaxy's spiral arms, impersonating a
wickedly luminous supernova. Transient
hunters beware!
NASA's Dawn spacecraft - the first
mission to a dwarf planet - arrived at
Ceres in 2015 and sent back photos and
other data before running out of fuel
in October 2018. Although officially
pronounced dead on November 1st that
year, mission scientists expect the probe
to orbit Ceres for at least another 50
years before it spirals downward and
crashes onto the dwarf planet's surface.
Dawn revealed that Ceres is rich in
water, clay, and organic compounds,
and may still harbor remnants of a subsurface
ocean. Brilliant white patches
in the 92-km-wide crater Occator are
M53
α
2
3
4
5
6
7
8
ε
M60
ρ
ο
sodium carbonate salt deposits thought
to have originated when fissures from a
massive meteorite strike allowed briny
waters to ooze onto the surface.
Ceres also has a lot of ammonia-rich
clay, which is an unusual substance
to find on a main-belt object, though
it's common in the outer solar system.
Its presence is the reason scientists
suspect that the dwarf planet originated
beyond the orbit of Saturn and
migrated inward. Astronomers also
believe Ceres is a protoplanet - a body
with sufficient mass and internal heat
to have a differentiated interior with
a core and mantle. Jupiter's take-nolosers
gravitational field stymied its
growth and path to planethood.
Dwarf planet, protoplanet, or asteroid
- no matter how you choose to
categorize it, Ceres awaits your attention
this spring.
sk yand tele scope .o r g * MARCH 2023 49
13h 00m
12h 40m
COMA
BERENICES
LEO
M100
M90
M91
M89
M59 M58
VIRGO
+10°
M88
M86
M87
M84
6 M98
M99
+15°
β
12h 20m
M85
4477
4473
4461
4435
M84
4267
12h 00m
+20°
4216
+13°
4212
4571
4459
+14°
M91
M88
M99
4298
4419
+15°
6
COMA BERENICES
25
22
21
20
19
23
24
26
27
28
29 30 31
M100
12h 30m
12h 25m
4350
12h 20m
4340
Apr
1 2 3 4 5
+16°
12h 15m
Path o
h
t
a
f 1 Ceres
1
f
o
Star magnitudes
Star magnitudes
P
e
C
e
s
r

Sky & Telescope - March 2023

Table of Contents for the Digital Edition of Sky & Telescope - March 2023

Contents
Sky & Telescope - March 2023 - Cover1
Sky & Telescope - March 2023 - Cover2
Sky & Telescope - March 2023 - 1
Sky & Telescope - March 2023 - Contents
Sky & Telescope - March 2023 - 3
Sky & Telescope - March 2023 - 4
Sky & Telescope - March 2023 - 5
Sky & Telescope - March 2023 - 6
Sky & Telescope - March 2023 - 7
Sky & Telescope - March 2023 - 8
Sky & Telescope - March 2023 - 9
Sky & Telescope - March 2023 - 10
Sky & Telescope - March 2023 - 11
Sky & Telescope - March 2023 - 12
Sky & Telescope - March 2023 - 13
Sky & Telescope - March 2023 - 14
Sky & Telescope - March 2023 - 15
Sky & Telescope - March 2023 - 16
Sky & Telescope - March 2023 - 17
Sky & Telescope - March 2023 - 18
Sky & Telescope - March 2023 - 19
Sky & Telescope - March 2023 - 20
Sky & Telescope - March 2023 - 21
Sky & Telescope - March 2023 - 22
Sky & Telescope - March 2023 - 23
Sky & Telescope - March 2023 - 24
Sky & Telescope - March 2023 - 25
Sky & Telescope - March 2023 - 26
Sky & Telescope - March 2023 - 27
Sky & Telescope - March 2023 - 28
Sky & Telescope - March 2023 - 29
Sky & Telescope - March 2023 - 30
Sky & Telescope - March 2023 - 31
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Sky & Telescope - March 2023 - 35
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Sky & Telescope - March 2023 - 37
Sky & Telescope - March 2023 - 38
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Sky & Telescope - March 2023 - 40
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Sky & Telescope - March 2023 - 49
Sky & Telescope - March 2023 - 50
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Sky & Telescope - March 2023 - 78
Sky & Telescope - March 2023 - 79
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Sky & Telescope - March 2023 - 81
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Sky & Telescope - March 2023 - 83
Sky & Telescope - March 2023 - 84
Sky & Telescope - March 2023 - Cover3
Sky & Telescope - March 2023 - Cover4
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