Uploaded by

BAA Comet Section

Observer

dbartlett

Observed

2025 Apr 06 - 00:00

Uploaded

2025 Apr 27 - 05:30

Objects

C/2023 A3 (Tsuchinshan-ATLAS)

Planetarium overlay

Constellation

Delphinus

Field centre

RA: 20^h23^m
Dec: +19°30'
Position angle: +0°17'

Field size

2°21' × 1°40'

Full filename

2023a3/2023a3_20250406_dbartlett.jpg

Target name

C/2023 A3 (Tsuchinshan-ATLAS)

Title

C/2023_A3_Tsuchinshan_ATLAS_2025_Apr_06_042632local Notes: Fine evening to catch this ~ 13.5 magnitude comet. Anti-Tail can be seen once again, however faint. Rich starfield in Delphinus. Bright blue planetary nebula NGC6905 , The Blue Flash Nebula, can be found at top right of field. Much dust and gas present in starfield. I've included the Finson & Probstein (FP) proposed a model describing the full tail geometry so the observer can compare. Full resolution link: https://app.astrobin.com/i/p649uo?r=B Observational Notes: scope: C14 fl729mm F/2 Camera: asi6200mcP image: 38x120sec Seeing: 4.5/5 Transparency: 9/10 Observer: DEBartlett Place: JuneLake California USA (Altitude +2434m) Image Info (all ): Down sampled 2x2 (CMOS = BIN 2x2) (All images processed solely using PixInsight) Projection ............... Gnomonic Projection origin ........ [1999.537145 1421.963415] px -> [RA: 20 23 43.497 Dec: +19 30 52.99] Resolution ............... 2.121 arcsec/px Rotation ................. 0.264 deg Reference system ......... ICRS Observation start time ... 2025-04-06 09:26:32 UTC Geodetic coordinates ..... 119 04 46 W 37 46 00 N 2434 m Focal distance ........... 731.42 mm Pixel size ............... 7.52 um Field of view ............ 2d 21' 23.8" x 1d 40' 32.0" Image center ............. RA: 20 23 43.497 Dec: +19 30 52.98 ex: -0.041293 px ey: +0.017540 px Image bounds: top-left .............. RA: 20 28 44.847 Dec: +20 20 22.35 ex: -1.161496 px ey: -0.907777 px top-right ............. RA: 20 18 42.722 Dec: +20 21 12.35 ex: +1.275548 px ey: -1.162588 px bottom-left ........... RA: 20 28 39.718 Dec: +18 40 09.61 ex: -1.337658 px ey: +0.145287 px bottom-right .......... RA: 20 18 43.982 Dec: +18 40 43.66 ex: +2.461229 px ey: +0.391935 px