Sky & Telescope - January 2022 - 48

Star magnitudes
ALFONS DIEPVENS
JANUARY 2022 OBSERVING
Celestial Calendar by Bob King
15
13
11
30¡
9
ο
7
Bowling
for Borrelly
January has a bite to it,
but you can bite back by
checking out a periodic
comet.
I
f you've ever gone bowling, you have a
pretty good idea of what the nucleus
of Comet 19P/Borrelly looks like. Up
close, it's shaped like a bowling pin
except that it's composed of ice and
dust and stands 8 kilometers (5 miles)
tall. We last got a good look at this periodic
comet in our telescopes when it
came to perihelion in May 2015. It does
so again on February 1st.
Borrelly passed closest to Earth
last December but will reach its peak
brightness of around 9th magnitude
in early January, dimming slightly by
month's end. Southern skywatchers
got their first good look at this dusty
visitor last autumn, and now the rest
of us can share in the icy bounty as
the comet ascends from western Cetus
into Pisces in the evening sky. Your best
views will come at the end of twilight,
Comet Borrelly displays a small coma and
short tail in this photo taken during its most recent
apparition, on August 12, 2015. According
to comet expert Alan Hale, Borrelly's current
return is the " best one it will have had in over
two decades. "
Baten
Kaitos
ζ
3
4
5
6
7
8
2h 00m
χ
720
50
τ
β
UV
Jan 1, 2022
1h 30m
1h 00m
Deneb Kaitos 0h 30m
7
pThroughout January, Comet 19P/Borrelly will be an early evening target as it traverses Cetus on
its way into Pisces. (The comet's positions are plotted for 0h UT.)
which coincidentally is the warmest
part of January nights. Based on past
apparitions, the comet should exhibit a
moderately compact coma and a short,
eastward-pointing tail. A 6-inch scope
will fish it out, but an 8- or 10-inch
instrument will better show Borrelly's
classic cometary form.
French astronomer Alphonse Borrelly
discovered the object on December
28, 1904, when it was also in Cetus and
moving northward. Borrelly worked at
Marseilles Observatory and discovered
18 asteroids and several more comets in
his lifetime. Comet 19P/Borrelly orbits
the Sun every 6.9 years and is a member
of the Jupiter-family of comets - a
passel of frozen leftovers with orbital
periods of fewer than 20 years and
molded by gravitational interactions
with the giant planet.
48 JANUARY 2022 * SKY & TELESCOPE
Borrelly became the second comet
(after 1P/Halley) to be imaged up close,
when NASA's Deep Space 1 spacecraft
flew just 2,170 kilometers from its
nucleus in September 2001. Laurence
Soderblom, who headed the Deep Space
1's camera team, noted at the time
that the photographs recorded " rugged
terrain, smooth, rolling plains, deep
fractures, and very, very dark material. "
The comet remains visible well into
spring, though it gradually fades as it
proceeds northeastward through Pisces,
Aries, Taurus, and Auriga. On the evening
of January 10th, Borrelly sweeps
2.3° northwest of the 10.9-magnitude
planetary nebula NGC 246, also known
as the Skull Nebula. The Moon stays
largely out of the picture from December
21st to January 6th, and again from
January 19th to February 3rd.
46
676
ν
α
Alrescha
Σ186
60
42
25
23
39
25
19
779
596
615
584
θ
37
η
φ4
φ3
246
CETUS
210
9
7
5
3
-15°
6
AC
337
15
φ φ1
2
13
11
157
ι
S
-10°
17
-5°
21
13
20
5 Cet
ξ
Feb 1
R
S138
ζ
5
μ
3 95
80
488
520
OΣ 18
31 89
29
10¡
474
428
27
0°
IC 1613
+5°
ε
20¡
δ
41
M74
660
π
PISCES
524
+10°
35
η
57
58
34
Algenib
γ +15°
Path of Comet 19P/Borrelly

Sky & Telescope - January 2022

Table of Contents for the Digital Edition of Sky & Telescope - January 2022

Contents
Sky & Telescope - January 2022 - Cover1
Sky & Telescope - January 2022 - Cover2
Sky & Telescope - January 2022 - 1
Sky & Telescope - January 2022 - Contents
Sky & Telescope - January 2022 - 3
Sky & Telescope - January 2022 - 4
Sky & Telescope - January 2022 - 5
Sky & Telescope - January 2022 - 6
Sky & Telescope - January 2022 - 7
Sky & Telescope - January 2022 - 8
Sky & Telescope - January 2022 - 9
Sky & Telescope - January 2022 - 10
Sky & Telescope - January 2022 - 11
Sky & Telescope - January 2022 - 12
Sky & Telescope - January 2022 - 13
Sky & Telescope - January 2022 - 14
Sky & Telescope - January 2022 - 15
Sky & Telescope - January 2022 - 16
Sky & Telescope - January 2022 - 17
Sky & Telescope - January 2022 - 18
Sky & Telescope - January 2022 - 19
Sky & Telescope - January 2022 - 20
Sky & Telescope - January 2022 - 21
Sky & Telescope - January 2022 - 22
Sky & Telescope - January 2022 - 23
Sky & Telescope - January 2022 - 24
Sky & Telescope - January 2022 - 25
Sky & Telescope - January 2022 - 26
Sky & Telescope - January 2022 - 27
Sky & Telescope - January 2022 - 28
Sky & Telescope - January 2022 - 29
Sky & Telescope - January 2022 - 30
Sky & Telescope - January 2022 - 31
Sky & Telescope - January 2022 - 32
Sky & Telescope - January 2022 - 33
Sky & Telescope - January 2022 - 34
Sky & Telescope - January 2022 - 35
Sky & Telescope - January 2022 - 36
Sky & Telescope - January 2022 - 37
Sky & Telescope - January 2022 - 38
Sky & Telescope - January 2022 - 39
Sky & Telescope - January 2022 - 40
Sky & Telescope - January 2022 - 41
Sky & Telescope - January 2022 - 42
Sky & Telescope - January 2022 - 43
Sky & Telescope - January 2022 - 44
Sky & Telescope - January 2022 - 45
Sky & Telescope - January 2022 - 46
Sky & Telescope - January 2022 - 47
Sky & Telescope - January 2022 - 48
Sky & Telescope - January 2022 - 49
Sky & Telescope - January 2022 - 50
Sky & Telescope - January 2022 - 51
Sky & Telescope - January 2022 - 52
Sky & Telescope - January 2022 - 53
Sky & Telescope - January 2022 - 54
Sky & Telescope - January 2022 - 55
Sky & Telescope - January 2022 - 56
Sky & Telescope - January 2022 - 57
Sky & Telescope - January 2022 - 58
Sky & Telescope - January 2022 - 59
Sky & Telescope - January 2022 - 60
Sky & Telescope - January 2022 - 61
Sky & Telescope - January 2022 - 62
Sky & Telescope - January 2022 - 63
Sky & Telescope - January 2022 - 64
Sky & Telescope - January 2022 - 65
Sky & Telescope - January 2022 - 66
Sky & Telescope - January 2022 - 67
Sky & Telescope - January 2022 - 68
Sky & Telescope - January 2022 - 69
Sky & Telescope - January 2022 - 70
Sky & Telescope - January 2022 - 71
Sky & Telescope - January 2022 - 72
Sky & Telescope - January 2022 - 73
Sky & Telescope - January 2022 - 74
Sky & Telescope - January 2022 - 75
Sky & Telescope - January 2022 - 76
Sky & Telescope - January 2022 - 77
Sky & Telescope - January 2022 - 78
Sky & Telescope - January 2022 - 79
Sky & Telescope - January 2022 - 80
Sky & Telescope - January 2022 - 81
Sky & Telescope - January 2022 - 82
Sky & Telescope - January 2022 - 83
Sky & Telescope - January 2022 - 84
Sky & Telescope - January 2022 - Cover3
Sky & Telescope - January 2022 - Cover4
Sky & Telescope - January 2022 - SA1
Sky & Telescope - January 2022 - SA2
Sky & Telescope - January 2022 - SA3
Sky & Telescope - January 2022 - SA4
Sky & Telescope - January 2022 - SA5
Sky & Telescope - January 2022 - SA6
Sky & Telescope - January 2022 - SA7
Sky & Telescope - January 2022 - SA8
Sky & Telescope - January 2022 - SA9
https://www.nxtbook.com/nxtbooks/aas/st_202207
https://www.nxtbook.com/nxtbooks/aas/st_202206
https://www.nxtbook.com/nxtbooks/aas/st_202205
https://www.nxtbook.com/nxtbooks/aas/st_202204
https://www.nxtbook.com/nxtbooks/aas/st_202203
https://www.nxtbook.com/nxtbooks/aas/st_202202
https://www.nxtbook.com/nxtbooks/aas/st_202201
https://www.nxtbook.com/nxtbooks/aas/st_202112
https://www.nxtbook.com/nxtbooks/aas/st_202111
https://www.nxtbook.com/nxtbooks/aas/st_202110
https://www.nxtbook.com/nxtbooks/aas/st_202109
https://www.nxtbook.com/nxtbooks/aas/st_202108
https://www.nxtbook.com/nxtbooks/aas/st_202107
https://www.nxtbook.com/nxtbooks/aas/st_202106
https://www.nxtbook.com/nxtbooks/aas/st_202105
https://www.nxtbook.com/nxtbooks/aas/st_202104
https://www.nxtbook.com/nxtbooks/aas/st_202103
https://www.nxtbook.com/nxtbooks/aas/st_202102
https://www.nxtbook.com/nxtbooks/aas/st_202101
https://www.nxtbook.com/nxtbooks/aas/skywatch_2021
https://www.nxtbook.com/nxtbooks/aas/st_202012
https://www.nxtbook.com/nxtbooks/aas/st_202011
https://www.nxtbook.com/nxtbooks/aas/st_202010
https://www.nxtbook.com/nxtbooks/aas/st_202009
https://www.nxtbook.com/nxtbooks/aas/st_202008
https://www.nxtbook.com/nxtbooks/aas/st_202007
https://www.nxtbook.com/nxtbooks/aas/st_202006
https://www.nxtbook.com/nxtbooks/aas/st_202005
https://www.nxtbook.com/nxtbooks/aas/st_202004
https://www.nxtbook.com/nxtbooks/aas/st_202003
https://www.nxtbook.com/nxtbooks/aas/st_202002
https://www.nxtbook.com/nxtbooks/aas/st_202001
https://www.nxtbook.com/nxtbooks/aas/st_201912
https://www.nxtbook.com/nxtbooks/aas/st_201911
https://www.nxtbook.com/nxtbooks/aas/st_201910
https://www.nxtbook.com/nxtbooks/aas/st_201909
https://www.nxtbook.com/nxtbooks/aas/st_201908
https://www.nxtbook.com/nxtbooks/aas/st_201907
https://www.nxtbook.com/nxtbooks/aas/st_201906
https://www.nxtbook.com/nxtbooks/aas/st_201905
https://www.nxtbook.com/nxtbooks/aas/st_201904
https://www.nxtbook.com/nxtbooks/aas/st_201903
https://www.nxtbook.com/nxtbooks/aas/st_201902
https://www.nxtbook.com/nxtbooks/aas/st_201901
https://www.nxtbook.com/nxtbooks/aas/st_201812
https://www.nxtbook.com/nxtbooks/aas/st_201811
https://www.nxtbook.com/nxtbooks/aas/st_201810
https://www.nxtbook.com/nxtbooks/aas/st_201809
https://www.nxtbook.com/nxtbooks/aas/st_201808
https://www.nxtbook.com/nxtbooks/aas/st_201807
https://www.nxtbook.com/nxtbooks/aas/st_201806
https://www.nxtbook.com/nxtbooks/aas/st_201805
https://www.nxtbook.com/nxtbooks/aas/st_201804
https://www.nxtbook.com/nxtbooks/aas/st_201803
https://www.nxtbook.com/nxtbooks/aas/st_201802
https://www.nxtbook.com/nxtbooks/aas/st_201801
https://www.nxtbook.com/nxtbooks/aas/st_201712
https://www.nxtbook.com/nxtbooks/aas/st_201711
https://www.nxtbook.com/nxtbooks/aas/st_201710
https://www.nxtbook.com/nxtbooks/aas/st_201709
https://www.nxtbook.com/nxtbooks/aas/st_201708
https://www.nxtbook.com/nxtbooks/aas/st_201707
https://www.nxtbook.com/nxtbooks/aas/st_201706
https://www.nxtbook.com/nxtbooks/aas/st_201705
https://www.nxtbook.com/nxtbooks/aas/st_201704
https://www.nxtbook.com/nxtbooks/aas/st_201703
https://www.nxtbook.com/nxtbooks/aas/st_201702
https://www.nxtbook.com/nxtbooks/aas/st_201701
https://www.nxtbook.com/nxtbooks/aas/st_201612
https://www.nxtbook.com/nxtbooks/aas/st_201611
https://www.nxtbook.com/nxtbooks/aas/st_201610
https://www.nxtbook.com/nxtbooks/aas/st_201609
https://www.nxtbook.com/nxtbooks/aas/st_201608
https://www.nxtbook.com/nxtbooks/aas/st_201607
https://www.nxtbook.com/nxtbooks/aas/st_201606
https://www.nxtbook.com/nxtbooks/aas/st_201605
https://www.nxtbook.com/nxtbooks/aas/st_201604
https://www.nxtbook.com/nxtbooks/aas/st_201603
https://www.nxtbook.com/nxtbooks/aas/st_201602
https://www.nxtbook.com/nxtbooks/aas/st_201601
https://www.nxtbook.com/nxtbooks/aas/st_201512
https://www.nxtbook.com/nxtbooks/aas/st_201511
https://www.nxtbook.com/nxtbooks/aas/st_201510
https://www.nxtbook.com/nxtbooks/aas/st_201509
https://www.nxtbook.com/nxtbooks/aas/st_201508
https://www.nxtbook.com/nxtbooks/aas/st_201507
https://www.nxtbook.com/nxtbooks/aas/st_201506
https://www.nxtbook.com/nxtbooks/aas/st_201505
https://www.nxtbook.com/nxtbooks/aas/st_201504
https://www.nxtbook.com/nxtbooks/aas/st_201503
https://www.nxtbook.com/nxtbooks/aas/st_201502
https://www.nxtbook.com/nxtbooks/aas/st_201501
https://www.nxtbook.com/nxtbooks/aas/st_201412
https://www.nxtbook.com/nxtbooks/aas/st_201411
https://www.nxtbook.com/nxtbooks/aas/st_201410
https://www.nxtbook.com/nxtbooks/aas/st_201409
https://www.nxtbook.com/nxtbooks/aas/st_201408
https://www.nxtbook.com/nxtbooks/aas/st_201407
https://www.nxtbook.com/nxtbooks/aas/st_201406
https://www.nxtbook.com/nxtbooks/aas/st_mars
https://www.nxtbook.com/nxtbooks/aas/st_201405
https://www.nxtbook.com/nxtbooks/aas/st_201404
https://www.nxtbook.com/nxtbooks/aas/st_201403
https://www.nxtbook.com/nxtbooks/aas/st_201402
https://www.nxtbook.com/nxtbooks/aas/st_201401
https://www.nxtbook.com/nxtbooks/aas/st_201312
https://www.nxtbook.com/nxtbooks/aas/st_201311
https://www.nxtbook.com/nxtbooks/aas/st_201310
https://www.nxtbook.com/nxtbooks/aas/st_201309
https://www.nxtbook.com/nxtbooks/aas/st_201308
https://www.nxtbook.com/nxtbooks/aas/st_201307
https://www.nxtbook.com/nxtbooks/aas/st_201306
https://www.nxtbook.com/nxtbooks/aas/st_201305
https://www.nxtbook.com/nxtbooks/aas/st_201304
https://www.nxtbook.com/nxtbooks/aas/st_201303
https://www.nxtbook.com/nxtbooks/aas/st_201302
https://www.nxtbook.com/nxtbooks/aas/st_201301
https://www.nxtbook.com/nxtbooks/aas/st_201212
https://www.nxtbook.com/nxtbooks/aas/st_201211
https://www.nxtbook.com/nxtbooks/aas/st_201210
https://www.nxtbook.com/nxtbooks/aas/st_201209
https://www.nxtbook.com/nxtbooks/aas/st_201208
https://www.nxtbook.com/nxtbooks/aas/st_201207
https://www.nxtbook.com/nxtbooks/aas/st_201206
https://www.nxtbook.com/nxtbooks/aas/st_201205
https://www.nxtbook.com/nxtbooks/aas/st_201204
https://www.nxtbook.com/nxtbooks/aas/st_201203
https://www.nxtbook.com/nxtbooks/aas/st_201202
https://www.nxtbook.com/nxtbooks/aas/st_201201
https://www.nxtbook.com/nxtbooks/aas/st_201112
https://www.nxtbook.com/nxtbooks/aas/st_201111
https://www.nxtbook.com/nxtbooks/aas/st_201110
https://www.nxtbook.com/nxtbooks/aas/st_201109
https://www.nxtbook.com/nxtbooks/aas/st_201108
https://www.nxtbook.com/nxtbooks/aas/st_201107
https://www.nxtbook.com/nxtbooks/aas/st_201106
https://www.nxtbook.com/nxtbooks/aas/st_201105
https://www.nxtbook.com/nxtbooks/aas/st_201104
https://www.nxtbook.com/nxtbooks/aas/st_201103
https://www.nxtbook.com/nxtbooks/aas/st_201102
https://www.nxtbook.com/nxtbooks/aas/st_201101
https://www.nxtbook.com/nxtbooks/aas/st_201012
https://www.nxtbook.com/nxtbooks/aas/st_201011
https://www.nxtbook.com/nxtbooks/aas/st_201010
https://www.nxtbook.com/nxtbooks/aas/st_201009
https://www.nxtbook.com/nxtbooks/aas/st_201008
https://www.nxtbook.com/nxtbooks/aas/st_201007
https://www.nxtbook.com/nxtbooks/aas/st_201006
https://www.nxtbook.com/nxtbooks/aas/st_201005
https://www.nxtbook.com/nxtbooks/aas/st_201004
https://www.nxtbook.com/nxtbooks/aas/st_201003
https://www.nxtbook.com/nxtbooks/aas/st_201002
https://www.nxtbook.com/nxtbooks/aas/st_201001
https://www.nxtbookmedia.com