405P/Lemmon (0405P)
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Type: Periodic
Perihelion date: 24 December 2020
Perihelion distance (q): 1.1
Aphelion distance (Q) : 6.1
Period (years): 6.9
Eccentricity (e): 0.69
Inclination (i): 9.4
JPL orbit diagram
COBS lightcurve
405P/Lemmon = 2013 TL117 = 2020 U1
An unusual asteroid, classified as an Amor, was discovered during the Mt Lemmon
survey with the 1.5m telescope on 4 October 2013 and was also designated as 2013
UT2. Further observations showed cometary characteristics, and the object was
given a cometary designation.
The Tisserand parameter of the orbit with respect to Jupiter is 2.64 and the object
can approach within 0.5 au of the planet and to 0.2 au from the Earth, which it did in
1980.
An object briefly appeared on the PCCP as P218YG3 before being transferred to the
"Previous NEOCP Objects" page having been identified as a return of comet 2013
TL117, though it was given on the page as 2013 TL17. The PCCP recovery was by
by PanSTARRS 2 on 25 October 2020. Erwin Schwab had recovered the comet on
17 October 2020 with the Calar Alto 0.8m Schmidt.
Observations (VEMag = visual equivalent magnitude)
Date
10x10 mag
Error
VEmag
Coma '
10-Jan-21
17.2
0.4
13-Jan-21
17.5
0.4
23-Jan-21
18.2
0.4
07-Feb-21
18.6
0.4
14-Feb-21
18.1
0.4
13-Mar-21
18.2
0.4
17-Mar-21
18.1
0.4
02-Apr-21
17.9
0.4
10-Apr-21
18.1
0.4