Forum der Vereinigung der Sternfreunde

COMET C/2021 Y1 (ATLAS)

H. Sato reports cometary activity of an asteroidal NEOCP candidate
(initially reported by ATLAS-MLO on Dec. 26 UT) in ten stacked 60-second images
taken on Dec. 29 by iTelescope Observatory, Mayhill (H06), noting a condensed
10" coma. Prediscovery positions were recovered from Nov. 2021.

Observer details:

215 Buchloe. Observer W. Hasubick. 0.44-m f/4.6 reflector + CCD.

Orbital elements:

C/2021 Y1 (ATLAS)
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5
T 2023 Apr. 30.88016 TT Rudenko
q 2.0336045 (2000.0) P Q
z -0.0002689 Peri. 245.80230 -0.00784601 -0.47115068
+/-0.0001341 Node 244.75196 +0.77299860 -0.56240827
e 1.0005468 Incl. 77.20708 -0.63435921 -0.67949538
From 155 observations 2021 Nov. 8-2022 Jan. 6, mean residual 0".7.

photometric power-law parameters H = 8.5 and 2.5n = 8 (because
numerous astrometric observations give the comet's magnitude as 17-18)