MPEC 1997-R12: 1997 RT5
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M.P.E.C. 1997-R12 Issued 1997 Sept. 10, 14:10 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Commission 20 of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/cfa/ps/mpc.html
1997 RT5
Observations:
J97R05T C1997 09 06.95833 23 00 21.29 -06 23 04.2 23.0 R 950
J97R05T C1997 09 06.99889 23 00 21.10 -06 23 05.5 950
J97R05T C1997 09 07.06715 23 00 20.79 -06 23 07.6 950
J97R05T C1997 09 07.08670 23 00 20.74 -06 23 08.5 950
J97R05T C1997 09 07.10470 23 00 20.63 -06 23 08.6 950
J97R05T* C1997 09 07.28714 23 00 19.84 -06 23 14.3 675
J97R05T C1997 09 07.42352 23 00 19.23 -06 23 18.4 675
J97R05T C1997 09 08.25432 23 00 15.57 -06 23 44.1 675
J97R05T C1997 09 08.38924 23 00 14.96 -06 23 48.2 675
J97R05T C1997 09 10.00484 23 00 07.88 -06 24 36.7 950
J97R05T C1997 09 10.02200 23 00 07.80 -06 24 37.7 950
J97R05T C1997 09 10.04023 23 00 07.70 -06 24 38.8 950
Observer details:
675 Palomar Mountain. Observers P. Nicholson, B. Gladman, J. A. Burns.
5-m Hale Telescope + CCD.
950 La Palma. Observers S. F. Green, N. McBride. 4.2-m William Herschel
Telescope + CCD.
Orbital elements:
1997 RT5
Assumed circular orbit
Epoch 1997 Sept. 9.0 TT = JDT 2450700.5 Marsden
(2000.0) P Q
n 0.00358510 Arg.lat. 180.08399 +0.96044101 +0.27144417
a 42.2800177 Node 163.74840 -0.25537382 +0.94758755
e 0.0000000 Incl. 12.84553 -0.11107333 +0.16851082
P 275 H 7.0 G 0.15
From 12 observations 1997 Sept. 6-10.
Ephemeris:
1997 RT5 a,e,i = 42.28, 0.00, 13
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1997 06 21 23 04.24 -05 54.8 42.009 42.280 104.8 1.3 23.4
1997 07 01 23 04.10 -05 56.2 41.850 42.280 114.4 1.3 23.4
1997 07 11 23 03.82 -05 58.4 41.703 42.280 124.0 1.1 23.4
1997 07 21 23 03.42 -06 01.4 41.572 42.280 133.7 1.0 23.4
1997 07 31 23 02.92 -06 05.1 41.461 42.280 143.4 0.8 23.4
1997 08 10 23 02.32 -06 09.4 41.373 42.280 153.1 0.6 23.3
1997 08 20 23 01.65 -06 14.1 41.312 42.280 162.9 0.4 23.3
1997 08 30 23 00.94 -06 19.0 41.278 42.280 172.7 0.2 23.3
1997 09 09 23 00.20 -06 24.1 41.274 42.280 177.4 0.1 23.2
1997 09 19 22 59.48 -06 29.1 41.299 42.280 167.4 0.3 23.3
1997 09 29 22 58.79 -06 33.9 41.353 42.280 157.5 0.5 23.3
1997 10 09 22 58.16 -06 38.4 41.435 42.280 147.4 0.7 23.3
1997 10 19 22 57.61 -06 42.3 41.542 42.280 137.4 0.9 23.4
1997 10 29 22 57.17 -06 45.5 41.671 42.280 127.3 1.1 23.4
1997 11 08 22 56.85 -06 48.0 41.818 42.280 117.2 1.2 23.4
1997 11 18 22 56.67 -06 49.6 41.979 42.280 107.1 1.3 23.4
1997 11 28 22 56.64 -06 50.3 42.149 42.280 97.0 1.3 23.4
1997 12 08 22 56.76 -06 50.0 42.323 42.280 86.8 1.3 23.4
1997 12 18 22 57.03 -06 48.9 42.495 42.280 76.8 1.3 23.5
1997 12 28 22 57.45 -06 46.8 42.660 42.280 66.7 1.2 23.5
This is obviously a case of the simultaneous independent discovery of
a transneptunian object, with both the Palomar and the La Palma teams
noting 1997 RT5 in the vicinity of the TNO 1996 RR20 on two nights,
although the Palomar nights were closer together because of bad weather
at La Palma. The ephemeris of 1997 RT5 is here back-dated,
because the object should already have been in the vicinity of 1996 RR20
at the time of the latter's June 28-29 recovery (MPEC 1997-N01).
Brian G. Marsden (C) Copyright 1997 MPC M.P.E.C. 1997-R12
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