With an arc of six oppositions, (47171) Lempo had a well-established orbit. Archival images from 1974 and 1976 were found in the DSS database and extended the arc of observations to refine the orbit even further.
The following astrometry was submitted to the Minor Planet Center:
47171 1974 06 18.70323 20 47 56.82 -22 22 10.6 260 47171 1976 05 30.76340 21 03 18.64 -21 44 05.7 260 47171 1976 09 16.47271 20 55 00.55 -22 23 51.2 260At 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 31 years instead of six years.
View the Discovery Announcement. See also MPEC 2000-O37, IAUC 7787, and IAUC 7807.
See also the Journal for Occultation Astronomy, Vol. 10, No. 4, page 20.
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1976 Sep. 16.47271 UTC RA 20h55m00.55s Dec. -22°23'51.2" 60-minute exposure Size = 255" x 255" Siding Spring Observatory-DSS plate S597-04O9 |
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1976 May 30.76340 UTC RA 21h03m18.64s Dec. -21°44'05.7" 60-minute exposure Size = 255" x 255" Siding Spring Observatory-DSS plate S529-02JA |
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1974 Jun. 18.70323 UTC RA 20h47m56.82s Dec. -22°22'10.6" 50-minute exposure Size = 255" x 255" Siding Spring Observatory-DSS plate S528-01WC |
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(47171) Lempo
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5 MPC M 349.31074 (2000.0) P Q n 0.00398910 Peri. 294.60336 +0.84175606 -0.51994594 T = 2457080.11651 JDT a 39.3748934 Node 97.02424 +0.53296101 +0.75747603 q = 30.5713200 e 0.2235834 Incl. 8.41645 +0.08601914 +0.39482437 P 247 H 4.9 G 0.15 U 3 From 85 observations at 6 oppositions, 1999-2005, mean residual 0".50. Residuals 19990930 695 0.3- 0.1- 20000905 309 0.2+ 0.0 20011016 644 0.4- 0.0 19990930 695 0.4- 0.0 20000905 309 0.2+ 0.0 20011016 644 0.3- 0.4- 19991001 695 0.2- 0.0 20000927 046 0.8+ 0.4+ 20011024 644 0.0 0.3+ 19991001 695 0.3- 0.2+ 20000927 046 0.4- 0.4+ 20011218 608 0.1+ 0.6+ 19991002 695 0.9- 0.2+ 20000927 046 0.5+ 0.2+ 20020811 608 0.2- 0.3+ 19991003 695 (0.4+ 2.4-) 20000927 046 0.4+ 0.1- 20020811 608 0.1- 0.2- 19991003 695 0.1+ 1.1- 20000927 046 0.2- 0.5- 20020811 608 0.6- 0.0 19991225 684 0.4- 0.9- 20000929 621 0.3+ 0.5+ 20020814 621 0.0 0.0 19991225 684 0.2+ 1.2- 20000929 621 0.2+ 0.1- 20020814 621 0.0 0.2+ 19991227 684 (0.6- 2.7-) 20000929 621 0.4- 0.3- 20020814 621 0.2+ 0.4+ 19991227 684 1.3- 1.4- 20000930 621 0.6+ 0.2+ 20020815 621 0.2+ 0.1+ 20000102 697 0.4+ 0.1+ 20000930 621 0.1+ 0.1+ 20020815 621 0.3+ 0.1+ 20000103 697 0.6+ 0.1- 20000930 621 1.2+ 0.1+ 20020815 621 0.0 0.8+ 20000104 697 0.7+ 0.4- 20001004 621 0.7+ 0.3+ 20020817 621 0.5- 0.2+ 20000729 474 0.6- 0.1- 20001004 621 0.8+ 0.3+ 20020908 608 0.5- 0.0 20000729 474 0.0 0.2+ 20001004 621 0.6+ 0.1+ 20020917 608 0.1- 0.7- 20000729 474 0.5- 0.4+ 20001004 621 0.3+ 0.3+ 20021007 608 0.2- 0.3- 20000730 474 0.2+ 0.0 20001004 621 0.9+ 0.5+ 20021106 644 0.1- 0.2- 20000730 474 0.0 0.2+ 20001004 621 0.3+ 0.2+ 20021106 644 0.0 0.2- 20000730 474 0.9- 0.5+ 20001022 046 0.3- 0.3+ 20021106 644 0.6- 0.4+ 20000730 474 0.4- 0.8+ 20001022 046 0.1+ 0.1- 20030924 621 0.1+ 0.3- 20000826 360 1.0+ 0.4- 20010525 675 0.1- 1.5- 20030924 621 0.4+ 0.4- 20000826 360 0.2- 0.3- 20010526 675 (0.9- 2.2-) 20030925 621 0.1+ 0.1- 20000826 360 0.7+ 0.4- 20010925 644 0.4+ 0.6- 20030925 621 0.6+ 0.1- 20000905 309 0.0 0.1+ 20010925 644 0.0 0.2- 20030926 621 0.0 0.3- 20000905 309 0.1+ 0.0 20010927 644 1.0- 0.4+ 20050831 644 0.1+ 0.1+ 20000905 309 0.1+ 0.0 20010927 644 1.3- 0.5+ 20050831 644 0.1+ 0.0 20000905 309 0.2+ 0.0 20011014 046 1.3- 1.7+ 20050831 644 0.0 0.2- 20000905 309 0.2+ 0.0 20011014 046 1.1- 1.9+ 20000905 309 0.3+ 0.1+ 20011016 644 0.3- 0.1-
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5 MPC M 349.28684 (2000.0) P Q n 0.00398868 Peri. 294.64825 +0.84136688 -0.52057542 T = 2457086.39128 JDT a 39.3776594 Node 97.02223 +0.53352707 +0.75707507 q = 30.5690135 e 0.2236965 Incl. 8.41643 +0.08631708 +0.39476395 P 247 H 4.9 G 0.15 U 2 From 86 observations at 8 oppositions, 1974-2005, mean residual 0".46. Residuals 19740618 413 0.3+ 0.3+ 20000905 309 0.2+ 0.1+ 20011016 644 0.2- 0.0 19760530 413 0.1- 0.4- 20000905 309 0.3+ 0.1+ 20011016 644 0.3- 0.0 19760916 413 0.1- 0.1- 20000905 309 0.2+ 0.1+ 20011016 644 0.2- 0.4- 19990930 695 0.5- 0.1- 20000905 309 0.2+ 0.1+ 20011024 644 0.1+ 0.3+ 19990930 695 0.7- 0.0 20000927 046 0.8+ 0.5+ 20011218 608 0.2+ 0.6+ 19991001 695 0.4- 0.0 20000927 046 0.4- 0.5+ 20020811 608 0.0 0.4+ 19991001 695 0.6- 0.2+ 20000927 046 0.5+ 0.2+ 20020811 608 0.1+ 0.2- 19991002 695 1.1- 0.2+ 20000927 046 0.3+ 0.0 20020811 608 0.5- 0.1+ 19991003 695 (0.1+ 2.4-) 20000927 046 0.3- 0.4- 20020814 621 0.1+ 0.0 19991003 695 0.2- 1.1- 20000929 621 0.3+ 0.5+ 20020814 621 0.1+ 0.2+ 19991225 684 0.7- 0.9- 20000929 621 0.1+ 0.1- 20020814 621 0.3+ 0.4+ 19991225 684 0.1- 1.2- 20000929 621 0.4- 0.2- 20020815 621 0.4+ 0.2+ 19991227 684 (0.9- 2.8-) 20000930 621 0.5+ 0.3+ 20020815 621 0.4+ 0.2+ 19991227 684 1.6- 1.4- 20000930 621 0.1+ 0.2+ 20020815 621 0.1+ 0.8+ 20000102 697 0.2+ 0.1+ 20000930 621 1.2+ 0.1+ 20020817 621 0.3- 0.3+ 20000103 697 0.3+ 0.1- 20001004 621 0.7+ 0.3+ 20020908 608 0.4- 0.0 20000104 697 0.4+ 0.4- 20001004 621 0.8+ 0.3+ 20020917 608 0.0 0.6- 20000729 474 0.6- 0.0 20001004 621 0.5+ 0.2+ 20021007 608 0.0 0.3- 20000729 474 0.0 0.3+ 20001004 621 0.3+ 0.4+ 20021106 644 0.0 0.2- 20000729 474 0.5- 0.5+ 20001004 621 0.9+ 0.6+ 20021106 644 0.1+ 0.2- 20000730 474 0.2+ 0.1+ 20001004 621 0.3+ 0.2+ 20021106 644 0.4- 0.5+ 20000730 474 0.0 0.3+ 20001022 046 0.4- 0.3+ 20030924 621 0.2+ 0.3- 20000730 474 0.9- 0.6+ 20001022 046 0.0 0.0 20030924 621 0.4+ 0.5- 20000730 474 0.3- 0.8+ 20010525 675 0.0 1.4- 20030925 621 0.1+ 0.2- 20000826 360 1.0+ 0.3- 20010526 675 (0.8- 2.1-) 20030925 621 0.6+ 0.2- 20000826 360 0.2- 0.3- 20010925 644 0.5+ 0.5- 20030926 621 0.0 0.4- 20000826 360 0.7+ 0.3- 20010925 644 0.1+ 0.1- 20050831 644 0.3- 0.2- 20000905 309 0.0 0.1+ 20010927 644 0.9- 0.4+ 20050831 644 0.4- 0.3- 20000905 309 0.1+ 0.1+ 20010927 644 1.1- 0.6+ 20050831 644 0.4- 0.5- 20000905 309 0.1+ 0.0 20011014 046 (1.2- 1.7+) 20000905 309 0.2+ 0.1+ 20011014 046 (1.0- 2.0+)
DSS precovery images are from DSS plate archive scans, which are © copyright California Institute of Technology.