RA 21h57m30.24s Dec. -19o52'51.6"
60-minute exposure
Size = 150" x 150"
Siding Spring Observatory-DSS plate XS601-A09K
RA 21h52m39.47s Dec. -21o37'43.0"
120-minute exposure
Size = 150" x 150"
European Southern Observatory, La Silla-DSS plate sr0600
This scattered-disk object (provisional designation: 2007 OR10) had been observed at only four oppositions, so the identification of two images from DSS in 1985 and 1991 was significant. The 1985 plate from the European Southern Observatory, La Silla, has an unusually long exposure of 120 minutes, and the object's motion can be seen during this interval; the length of the trail is 3.5" in position angle 255o (to the right and slightly down).
The following astrometry was submitted to the Minor Planet Center:
K07O10R 1985 08 19.19084 21 52 39.47 -21 37 43.0 262
K07O10R 1991 10 01.47296 21 57 30.24 -19 52 51.6 260
At the end of this page are the elements and residuals before and with the new data. The new orbit is much more accurate because the object
has now been observed for 23 years instead of seven years. It was numbered on 2009-11-02 and later named.
View the Discovery Announcement.
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1991 Oct. 01.47296 UTC RA 21h57m30.24s Dec. -19o52'51.6" 60-minute exposure Size = 150" x 150" Siding Spring Observatory-DSS plate XS601-A09K |
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1985 Aug. 19.19084 UTC RA 21h52m39.47s Dec. -21o37'43.0" 120-minute exposure Size = 150" x 150" European Southern Observatory, La Silla-DSS plate sr0600 |
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2007 OR10
Epoch 2009 June 18.0 TT = JDT 2455000.5 MPC M 99.50811 (2000.0) P Q n 0.00178403 Peri. 207.39988 -0.97192239 +0.12323562 T = 2399223.41252 JDT a 67.3288112 Node 336.86787 +0.07947214 -0.62990016 q = 33.6802976 e 0.4997640 Incl. 30.67980 -0.22147471 -0.76683686 P 552 H 1.9 G 0.15 U 5 From 33 observations at 4 oppositions, 2001-2008, mean residual 0".34. Residuals 20010827 644 0.1+ 0.1- 20070721 675 0.2- 0.1- 20080617 675 0.4- 0.1- 20020811 644 0.5- 0.4+ 20070808 675 0.3- 0.1- 20080703 675 0.3- 0.0 20020818 644 0.5- 0.1+ 20070808 675 0.1- 0.6- 20080703 675 0.1- 0.6+ 20020819 644 0.4+ 0.4+ 20070808 675 0.1- 0.2- 20080704 675 0.1- 0.2- 20020819 644 0.0 0.7- 20070905 675 0.4+ 0.3- 20080704 675 0.5- 0.0 20020915 644 0.3+ 0.3- 20070905 675 0.2+ 0.0 20080806 675 0.2- 0.3+ 20020915 644 0.1- 0.5+ 20071015 675 0.2- 0.0 20080806 675 0.1+ 0.4+ 20070717 675 0.5+ 0.7- 20071016 675 0.3- 0.0 20080808 675 0.3- 0.4- 20070717 675 0.6+ 0.3+ 20071016 675 0.3- 0.2- 20080808 675 0.1+ 0.1- 20070718 675 0.9+ 0.3+ 20080612 675 0.2- 0.1- 20080823 807 0.5+ 0.1+ 20070718 675 0.3+ 0.7+ 20080616 675 0.2- 0.0 20080823 807 0.5+ 0.3+
2007 OR10
Epoch 2009 June 18.0 TT = JDT 2455000.5 MPC M 99.23212 (2000.0) P Q n 0.00178184 Peri. 207.49984 -0.97170631 +0.12493134 T = 2399309.79622 JDT a 67.3839297 Node 336.86795 +0.07837038 -0.63004077 q = 33.6618563 e 0.5004468 Incl. 30.67954 -0.22281141 -0.76644686 P 553 H 1.9 G 0.15 U 4 From 35 observations at 6 oppositions, 1985-2008, mean residual 0".35. Residuals 19850819 809 0.2- 0.4+ 20070718 675 0.3+ 0.7+ 20080617 675 0.4- 0.0 19911001 413 0.1+ 0.6- 20070721 675 0.3- 0.1- 20080703 675 0.3- 0.0 20010827 644 0.2+ 0.0 20070808 675 0.3- 0.2- 20080703 675 0.1- 0.6+ 20020811 644 0.5- 0.4+ 20070808 675 0.1- 0.6- 20080704 675 0.0 0.1- 20020818 644 0.5- 0.1+ 20070808 675 0.2- 0.2- 20080704 675 0.4- 0.0 20020819 644 0.4+ 0.4+ 20070905 675 0.4+ 0.3- 20080806 675 0.1- 0.3+ 20020819 644 0.1+ 0.7- 20070905 675 0.1+ 0.1- 20080806 675 0.1+ 0.4+ 20020915 644 0.4+ 0.2- 20071015 675 0.3- 0.1- 20080808 675 0.3- 0.4- 20020915 644 0.0 0.6+ 20071016 675 0.3- 0.1- 20080808 675 0.1+ 0.0 20070717 675 0.4+ 0.8- 20071016 675 0.3- 0.2- 20080823 807 0.5+ 0.2+ 20070717 675 0.6+ 0.3+ 20080612 675 0.2- 0.1- 20080823 807 0.5+ 0.3+ 20070718 675 0.8+ 0.2+ 20080616 675 0.2- 0.0
DSS precovery images are from DSS plate archive scans, which are copyright California Institute of Technology.