Forum der Vereinigung der Sternfreunde

COMET P/2021 R9 (Sheppard-Tholen)

D. J. Tholen reports the discovery of a comet in archival images
observed by Mauna Kea-Subaru (T09) on Sep. 5 2021 UT, noting a very
condensed 1".7 coma and a straight tail at position angle 220-245 deg.
Prediscovery positions were reported back to 2008.

Orbital elements:
P/2021 R9 (Sheppard-Tholen)
Epoch 2022 Aug. 9.0 TT = JDT 2459800.5
T 2022 Aug. 18.05625 TT Rudenko
q 4.6269202 (2000.0) P Q
n 0.07347223 Peri. 97.53254 +0.75645402 -0.64492285
a 5.6457360 Node 302.69689 +0.53741239 +0.70775655
e 0.1804576 Incl. 7.43292 +0.37278041 +0.28836639
P 13.4
From 46 observations 2007 June 6-2022 Jan. 25, mean residual 0".3.