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Comet C/2023 A3 (Tsuchinshan-ATLAS)
I decided to take a final (?) snapshot of comet
C/2023 A3 (Tsuchinshan-ATLS),
so I went to Carranza Field in Wharton State Forest, NJ, on
October 28, 2024. The sky was mostly cloud free, but
transparency didn't seem particularly good. The comet was first spotted
with 12x50 binoculars a couple of minutes after arrival at 7:34 pm EDT,
and a few minutes after the end of astronomical twilight at 7:31
pm. The visible tail in the 12x50s was
nearly 2° long, but in the image, it extends most of the 4° span to 66 Oph.
The comet was not seen with unaided eyes; it's now around
magnitude 6 based on
estimates at COBS.
Here's a
tabulation of my
October and
November 2024 sightings.
This snapshot is from a single raw frame taken taken at 7:43 pm
with a Canon EOS RP DSLM camera and a Canon 200 mm, f/2.8L
telephoto lens
on a fixed tripod. It was exposed 4 seconds at f/2.8, ISO 4000
and set to 4500 K white balance. It was mildly adjusted and
slightly cropped to a
field approximately 9.4° wide x 6.3° high. Note that focus is
unintentionally imperfect. I initially focused on the viewing
screen at 1x, then neglected to refine it at 5x and 10x. Unless
enlarged, it's not noticeable, and may even enhance the
non-enlarged view. Mouseover for labels.
Taurus Poniatovii is an obsolete constellation, but its
distinctive, Hyades-like V-shaped head (shown on mouseover), is
visible with unaided eyes from a dark site. The open cluster, IC
4665, is also visible with unaided eyes on a good night at a
dark site, the only IC object I know of that is so. Both are easy in binoculars, even at a
not-so-dark site. Barnard's Star, V2500 Oph, is in the
neighborhood too (shown on mouseover).
More about it here. The most
recent estimates at AAVSO are nominally magnitude 9.5.
Comet C/2023 A3 (Tsuchinshan-ATLAS)
Comet
C/2023 A3 (Tsuchinshan-ATLS) was observed from the
semi-suburban field
behind the Columbus Farmers Market on Rt 206 in Columbus, NJ, on
October 22, 2024. The sky was cloud free, but
there was a definite haze and the odor of smoke, probably from a
fire in the Pines (it's been dry spell). The comet was spotted
with 12x50 binoculars at 6:59 pm EDT and the visual tail was
about 2° long. In the picture, the tail extends about 5° from
the nucleus, although it's difficult to gauge because the
endpoint is vague.
Here's a tabulation of my October 2024 sightings.
This snapshot is from a single raw frame taken taken at 7:31 pm
with a Canon EOS RP DSLM camera and a Yongnuo 85 mm, f/1.8 lens
on a fixed tripod. It was exposed 1 second at f/1.8, ISO 3200
and set to 4800 K white balance. It was mildly adjusted and cropped to a
field approximately 17° wide x 14° high. Mouseover for labels.
Comet C/2023 A3 (Tsuchinshan-ATLAS)
Comet
C/2023 A3 (Tsuchinshan-ATLS) was observed from Carranza
Field in Wharton State Forest, NJ, on
October 19, 2024. With unaided eyes, and averted
vision, about 10° of the tail's length could be seen. With 8x42
binoculars and a 115 mm spotting scope at 35x, about 15° of tail
could be seen, although not all at once, one needed to sweep
along it's length. It was a splendid view!
This snapshot is from a single raw frame taken taken at 7:23 pm
EDT with a Canon EOS RP DSLM camera and a 50 mm Sigma Art lens
on a fixed tripod. It was exposed 4 seconds at f/2.0, ISO 3200
and auto white balance. It was mildly adjusted and cropped to a
field approximately 19° square. Mouseover for labels.
Comet C/2023 A3 (Tsuchinshan-ATLAS)
On
October 14, 2024, the sky cleared by sunset, so I went to Bishops Gate in Mt
Laurel to attempt to observe comet
C/2023 A3 (Tsuchinshan-ATLAS). It was first sighted with
12x50 binoculars at 6:59 pm EDT, 38 minutes after sunset at 6:21
pm and then with unaided eyes at 7:15 pm, including a visible
tail that extended upwards for a couple of degrees. It was also
observed with a 115 mm spotting scope at 35x. Clouds moved in as
the comet approached setting at 8:28 pm, and by 8:15 pm, it was
completely overcast to the west.
This snapshot was taken at 7:27 pm with a Canon EOS RP
DSLM camera and a Canon 200 mm f/2.8L telephoto lens on a fixed
tripod. It's from a single raw frame exposed 1 second at f/2.8,
ISO 1600 and 5600 K white balance. It was mildly adjusted in
Canon's Digital Photo Professional then cropped to a field about
6° wide x 8° high. In this view, the tail is about 6° long. 5.5°
above the nucleus, the tail crosses the globular cluster,
Messier 5, next to the star 5 Serpentis. Mouseover for
labels.
Aurorae
in Suburban New Jersey
On
October 10, 2024, I went to Bishops Gate in Mt
Laurel to attempt my first sighting of comet
C/2023 A3 (Tsuchinshan-ATLAS) in the evening sky after solar
conjunction on October 9, but the solar elongation was only about 8°. Sunset
was at 6:27 pm EDT and I looked for it unsuccessfully between
6:25 and 7:00 pm with 15x56 binoculars and at 25x88 with a spotting
scope. I also looked for the extended tail of the comet from
7:00 to 7:15 pm unsuccessfully.
As I was finishing packing up, I turned around from the
car and looked to the west, the approximate azimuth of the
comet, and was astonished to see a reddish glow in the sky -
aurora! I had seen the internet traffic
earlier in the day about the
possibility of aurora this evening, but I wasn't optimistic
about seeing anything (as if aurorae go out of their way to
avoid me; it's probably been close to twenty years since I've
seen any). Regardless, the reddish glow was easy to see, and I
ultimately saw some greenish color too, which shows much better in
the pictures than to the unaided eye. In the picture below, I
visually saw a pale gray patch, but in the smartphone's live
view, it was unmistakably green. The display lasted from about
7:20 until 7:45 pm. I then left, but came back and met with a
friend there around 9 pm. We hung around, and then just after 10
pm, I noticed a reddish patch to the west and we had some
more aurorae until nearly 11 pm, but not as intense as the first round
I saw earlier. Splendid nevertheless.
Both of these snapshots were taken with a handheld iPhone
11. The one above at 7:26 pm looking roughly north, the one
below at 7:29 pm looking roughly northeast.
Comet C/2023 A3 (Tsuchinshan-ATLAS) — Not
On
October 6, 2024, I made a dawn visit to the
observation platform parking lot at Thompson's Beach, NJ, hoping
to make a final sighting of comet
C/2023 A3 (Tsuchinshan-ATLAS)
before it reaches solar conjunction on October 9, then moves
into our evening sky. My last sighting was on the morning of
October 4 from Swede Run in Moorestown, NJ, a suburban location,
when the coma, with a strong central condensation and a stubby
tail, was spotted with 15x56 binoculars at 6:13 am, 16½° solar
elongation.
Thompson's Beach is a dark site (for New Jersey), and being in a
vast salt marsh, the horizons are quite low towards the east.
I've spotted rising Mercury and Venus at less than a degree
apparent altitude from this spot. When I arrived on October 6,
shortly before the start of astronomical twilight at 5:30 am
EDT, I was able to see Uranus, M35, M41 and M47 with unaided
eyes. However, even in the dark, I could see the all-to-familiar
streaky clouds along the eastern horizon.
This picture was taken at 6:18 am, 4 minutes after A3 rose
at 6:14 am and 47 minutes before sunrise. For reference, the red
dot (a distant antenna tower) at the top of the tree line left
of center is at 92° azimuth (as determined by stars visible in
an earlier picture taken when it was dark). The coma here would
have been about three-quarters of a degree altitude, 95° azimuth
and 11½° solar elongation, but it's masked by the streaky
clouds. There's also no sign of the extended tail (at least 10°
long) that would have been projecting up and to the right of the
coma. Neither the coma nor the tail were seen visually with
unaided eyes, 8x42 or 15x56 binoculars through 6:30 am.
Captured with a Canon EOS RP DSLM camera with a 100 mm f/2.8L
telephoto/macro lens on a fixed tripod. Exposed 1/4 second at
f/4.0, ISO 800, automatic white balance. It's a single raw frame
unprocessed, other than cropping to a 16:9 ratio using 77% of
the width and 65% of the height for a field 15.7° wide x 8.9°
high, then converting to this JPEG with Canon's Digital Photo
Professional 4.
Foggy Mercury & Regulus
On
September 11, 2024, the swift-moving planet
Mercury was 3.1°
from the first-magnitude star Regulus, Alpha Leonis
(mouseover for labels). This
image was captured at 5:38 am EDT from Swede Run in Moorestown,
NJ, when Mercury was at 3.9° altitude, shortly
after rising in streaky clouds and as seen through ground fog
during morning twilight, which began at 5:05 am EDT; sunrise
would be at 6:37 am. Taken with a
Canon EOS RP DSLM camera and a Canon 200 mm f/2.8L telephoto lens
on a fixed tripod. This single raw frame was automatically
exposed 1.6 seconds at f/2.8,
ISO 1600 with auto white balance. It was slightly adjusted with
Canon's Digital Photo Professional 4 and not cropped for a field
10.3° wide x 6.9° high. Spotting Mercury (initially with 12x50
binoculars and later with unaided eyes) completed an overnight
seven-planet sighting sweep.
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October 28, 2024
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October 14, 2024
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Last Update: Wednesday, November 13, 2024 at 10:53 AM Eastern Time