by Anne Holt Sunrise. 1st: 07.54 29th: 06.58 Sunset. 1st: 16.50 29th: 17.45 Astronomical darkness: 1st: 18.51 to 05.52 29th: 19.41 to 04.59 Day length, 1st: 08. 55. 41 29th: 10.47.30 Full Moon: 9th at 07.33 New Moon: 23rd at 15.32 Lunar perigee: 10th at 20.22 (360463 km) Lunar apogee: 26th at 11.36 (406276 km) This
month's full Moon is the 4th largest of the year but it may or may not
be a Supermoon, depending on which definition you use. Some say that any
full Moon near the Lunar perigee, which this one is, qualifies. Other
definitions are any full Moon occurring at a distance of 360,000 km or
less, or those which are 90% or more of the Moon's maximum size, (a
distance of 361,885 km or less). February's full Moon, at a distance of
362,472 km, doesn't meet either of these criteria. The
February full Moon is known as the Snow Moon. Other names are the
Hunger Moon, the Medieval English Storm Moon and the Chinese Budding
Moon. Highlights (and lows) Venus is
shining brightly, a magnificent sight in the evening sky, Mercury has
its best evening showing of the year in the second week of the month, but
the rest of the naked eye planets are very low in the pre-dawn sky. Two
newly discovered comets are predicted to get no brighter than mag 10
and 15, and we have no meteor showers visible from the Northern
Hemisphere. We do still have a reasonable amount of astronomical
darkness - 11 hours at the start of February and about 9 and a quarter
at month end. However, by the end of the month it doesn't begin until
19.41, well after the start of HPAG meetings. And, if clouds
don't spoil our view of the night sky, the ever increasing number of
Starlink satellites will probably manage to do the job. Constellations Orion and Taurus are now above the horizon as the sky darkens but start to set at around 2am at the start of February and soon after midnight by the end of the month. Gemini and Auriga are still prominent, remaining above the horizon until the early hours. Leo, the signpost constellation of Spring, is now high in the sky for most of the night and Bootes, with it's bright red star Arcturus is rising soon after 11, and around 9 at month end. In the early part of the evening the Plough is low in the North East standing on its 'handle', and Cassiopeia high in the North West as darkness falls. By month end, the Summer Triangle will have risen soon after 3am - summer already? Someone better tell the weather. Planets Mercury: in Capricorn, mag -1.0 Starts
the month as an evening object, best seen in the second week. On 1st
it is only 6 degrees above the horizon at dusk, setting at 18.03. It
moves into Aquarius on 2nd and by 4th it is at 8 degrees in the SW at
17.15, setting just over an hour later. Over the next week or so it
gets higher in the early evening sky and also brightens. From 8th to
12th it is at 10 degrees when the sky begins to darken around 17.30. It
reaches greatest eastern elongation on 10th, when it appears 18 degrees
from the Sun and is at mag -0.7. Two days later it is at its highest
point, 14 degrees, at sunset, though still down to 10 degrees by the
time the sky begins to darken. It will then be at mag -0.4 and should
be visible soon after sunset, to the east of Venus and at about one
third the altitude. Mercury's position then deteriorates rapidly, by
17th it is down to mag 0.8 and only 6 degrees above the horizon at
dusk. It reaches inferior solar conjunction on 26th and then becomes a
morning object, but too close to the Sun to be visible. On 29th it
rises half an hour before the Sun but appears separated from it by only 7
degrees. . Venus: in Aquarius, mag -4.1 Unmissable
in the evening sky - weather permitting. On 1st it should be easily
visible soon after 17.00, when it is at 25 degrees in the SW. It moves
into Pisces on 3rd and by mid February is 30 degrees above the horizon
at around 17.30. On 27th the 14% Moon passes 6 degrees south of the
planet, they are still quite close on the following evening, when the
now 21% lit Moon is 12.3 degrees to the SE. On 29th Venus is easily
visible for at least 3 hours. It's at 33 degrees in the south at 18.03
in astronomical darkness, setting just after 22.00. A telescope will
show the planet's gibbous phase - 62% lit at month end. Mars: in Ophiuchus, mag 1.4 A
morning object but still very low and not getting much higher in the
dawn sky during the month because of its relatively fast eastward
motion. It rises on 1st at 04.53 and only reaches 10 degrees by dawn.
It moves into Sagittarius on 12th when it is slightly higher - 11
degrees as the sky brightens. On 18th the waning crescent Moon passes
3.2 degrees from the planet just before dawn. They will be in the same
binocular field of view but, as always, TAKE CARE, the Sun rises at
07.20 on this day. Saturn and Jupiter are also close by around this
time. On 29th Mars rises at 04.31 and reaches 12 degrees by dawn,
slightly brighter at mag 1.1. Jupiter: in Sagittarius, mag 0.6 Very
low in the morning sky. On 1st it rises at 06.36 but only reaches 4
degrees above the horizon by dawn. On 19th the 17% Moon passes 6 degrees
west of the planet soon after it rises at 05.39. The pair are closest,
in daylight, at 19.40. Because it is so bright it might be possible to
spot it in the last few days of the month, from a site with a low,
clear SE horizon. On 29th it rises at 05.06 and reaches 8 degrees by
06.30. Saturn: in Sagittarius, mag 0.6 Another
morning object, lower and fainter than Jupiter, so very difficult to
see this month. On 1st it is still below the horizon when the sky begins
to brighten, rising only 40 minutes before the Sun. The thin crescent
Moon is close to the planet on the morning of 20th, but the pair are
only just above the horizon at dawn. On 29th it rises at 05.32, on this
day it forms a line with Mars and Jupiter, very low in the SE just
before dawn. Uranus: in Aries, mag 5.8 Much
better positioned than the 2 gas giants, but even this is now past its
best, culminating before the sky is fully dark. On 1st it is at 47
degrees in the south as the sky darkens soon after 18.00 and should be
high enough for observing until around 22.00, setting at 00.40. On this
evening the Moon passes 7 degrees ESE of the planet at 19.00. On 28th,
at this time, the Moon is 4 degrees to the SE. It is 32 degrees above
the SW horizon,, setting at 22.51. Uranus should easily be visible in
binoculars, maybe even with the naked eye from a dark sky site. Neptune: in Aquarius, mag 7.8 Now
too low in the evening sky for telescopic observation. On 1st it is
only 14 degrees above the horizon at dusk, setting at 20.08. By 29th it
appears 8 degrees from the Sun, setting only 40 minutes after it. Dwarf Planets Ceres: in Capricorn, mag 9 Too
close to the Sun to be visible this month, following January's solar
conjunction. On 1st it rises a few minutes after the Sun, by month end
it rises only 10 minutes before it. The
remaining dwarf planets are very distant, orbiting way out in the
Kuiper belt, so their apparent motion against the background stars is
extremely slow. Pluto, the closest of these, moves on average 1.45
degrees per year, Eris, the furthest, only 0.65 degrees, so don't expect
to see any difference in images taken only a few days apart. Pluto: in Sagittarius, mag 15.1 Again,
not visible after last month's conjunction. On 1st it rises 40 minutes
before the Sun and 90 minutes after it on 29th. However it remains
much too low for telescopic observing or imaging. Haumea; in Bootes, mag 17.4 Reasonably
high in the sky for a good part of the night, On 1st it is at 21
degrees around 1am, culminating, 52 degrees in the south, at 05.50. On
29th it reaches 21 degrees at 23.00 and culminates at 4am, again at 52
degrees. It is still high, 48 degrees in the SW, as the sky begins to
brighten. Makemake: in Coma Berenices, mag 17.2 Slightly
higher than Haumea. On 1st it is at 21 degrees - high enough for
imaging - by 23.00, culminating at 04.35 when it reaches 59 degrees. On
29th it gets to 21 degrees in the east at 21.06 and culminates, a
little higher at 60 degrees, at 02.24. It is still high as dawn breaks,
46 degrees in the SW at 05.35. Eris: in Cetus, mag 18.8 Extremely
distant, faint, and slow moving against the background stars. On 1st it
culminates only a few minutes after sunset and is at 32 degrees in the
south soon after 18.00. By month end it is only 17 degrees above the
horizon at dusk - too low for imaging. Comets According
to in-the-sky 'comets are intrinsically unpredictable and magnitude
estimates must always be taken with a pinch of salt.' C/2017 T2 (PanSTARRS) in Perseus, mag 9.2 (or perhaps 10) Circumpolar.
On 1st it is at its highest point, 83 degrees in the NW, at dusk and is
down to 21 degrees in the north by dawn. It moves into Cassiopeia on
13th, when it is 73 degrees in the NW at dusk and 23 degrees in the
north at dawn. It moves along the side of the W asterism, on 21st it
passes between 2 open clusters, Stock 2, (the Muscleman) and NGC 743.
By 29th it should have brightened slightly, maybe to around mag 8.9, and
be at 62 degrees NW at dusk, and round to 26 degrees in the north by
dawn. C/2018 N2 (ASSASSN) in Andromeda, mag somewhere around 11 or 12. Also
circumpolar. On 1st it is at 56 degrees in the west at 18.14, shortly
before the start of astro darkness, and down to 21 degrees in the north
by 22.30. By month end it is at 38 degrees in the NW at dusk, down to
22 degrees by 21.34. It is then too low for imaging until 05.30, when
it reaches 21 degrees in the NE shortly before dawn. We
have a couple of newly discovered comets, however neither is predicted
to reach anything near naked eye brightness. Still, you never know. C/2019 Y1 (ATLAS) in Aquarius, mag 11.5. Currently
very low in the evening sky, a little SE of Venus. Moves into Pisces on
4th and could reach mag 10 in late Feb / early March. C/2020 A2 (Iwamoto) in Hercules, Very
faint morning object moving northwards, crosses into Lyra on 3rd and
into Draco by the end of the month. Not expected to get brighter than
mag 15. A chart of this one's position can be found at https://britastro.org/node/20410 For more information and exact positions of all solar system objects: and, for comets: Meteor showers |