MPEC 2021-X149 :
Zitat:
COMET P/2021 R8 (Sheppard)
S. Sheppard and D. Tholen report the discovery by Sheppard of a comet in
290 second sidereally-tracked exposures taken on Sep. 5 UT by Mauna Kea-
UH/Tholen NEO Follow-Up (Subaru) telescope (T09), noting a condensed 1".1 coma
and a straight 15" tail at position angle 240 deg. Prediscovery images were
reported to Aug. 2021. Additional reports of cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
T09 2021-09-06 S. Sheppard 0".9 15" 240
F52 2021-09-30 R. Weryk 0".6 4x45s
Orbital elements:
P/2021 R8 (Sheppard)
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5
T 2021 Oct. 7.45058 TT Bell
q 2.1310089 (2000.0) P Q
n 0.18805055 Peri. 190.76904 +0.99923023 +0.03826854
a 3.0173080 Node 167.02845 -0.03252630 +0.93117842
e 0.2937384 Incl. 2.20332 -0.02193158 +0.36254968
P 5.24
From 26 observations 2021 Aug. 12-Dec. 7, mean residual 0".3.
CBET 5079:
Helligkeit ca. 22.5 mag Mitte Dezember, H = 18.5 and 2.5n = 8
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