C/2021 Y1 (ATLAS) 2022-Nov-22 Dan Bartlett

Quite a messy field and the best I could do...
C/2021 Y1 (ATLAS) slid past Aldebaran on the 19th & 20th, when Todd (midmoastro) emailed a question about a greenish artifact (possibly caused by Aldebaran) from his imaging session. I had just arrived at my location, and setup the scope. Bringing the passage of conjunction to my attention I decided to hit the area myself on the 22, and the23rd. Aldebaran does introduce glaring artifacts to the telescope field. I'll publish the data (if the high clouds haven't ruined the stacking) from the 23rd where I've shifted the field to include more of the Hyades.

Thanks Todd for the heads up.

Dan

Observational details:
scope: RASA11 D = 279mm; fl =618mm; F# 2.2
camera: asi 2600mcP
exposure: 46 x 60 seconds
Seeing: 4/5
Transparency: 7/10
Observer: DEBartlett
Location: June Lake, California, USA

Image details:
Projection ............... Gnomonic
Projection origin ........ [1009.061999 1534.962943] px -> [RA: 4 34 55.505 Dec: +16 08 10.18]
Resolution ............... 2.509 arcsec/px
Rotation ................. 0.738 deg
Reference system ......... ICRS
Observation start time ... 2022-11-22 09:12:30 UTC
Observation end time ..... 2022-11-22 09:13:30 UTC
Geodetic coordinates ..... 119 04 46 W 37 46 51 N 2360 m
Focal distance ........... 618.15 mm
Pixel size ............... 7.52 um
Field of view ............ 1d 24' 22.4" x 2d 8' 21.4"
Image center ............. RA: 4 34 55.504 Dec: +16 08 10.18 ex: -0.006045 px ey: +0.000974 px
Image bounds:
top-left .............. RA: 4 37 55.596 Dec: +17 11 43.70 ex: -0.001478 px ey: -0.002340 px
top-right ............. RA: 4 32 02.403 Dec: +17 12 50.59 ex: -0.002675 px ey: +0.004611 px
bottom-left ........... RA: 4 37 46.746 Dec: +15 03 20.80 ex: +0.001843 px ey: +0.002576 px
bottom-right .......... RA: 4 31 57.238 Dec: +15 04 27.20 ex: -0.003203 px ey: +0.000167 px

Full resolution:https://astrob.in/30mm8d/B/