+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   952 Caia (1916 S61) Classification: Main-belt Asteroid          SPK-ID: 2000952 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256868 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2470856 n/a   a 2.9890982 n/a AU q 2.2505351 n/a AU i 10.03386 n/a deg node 18.61728 n/a deg peri 354.60434 n/a deg M 254.99509 n/a deg tp 2456951.0741355 (2014-Oct-20.57413550) n/a JED period 1887.5944826 5.17 n/a n/a d yr n 0.19071893 n/a deg/d Q 3.7276613 n/a AU   Orbit Determination Parameters    # obs. used (total)      1085      first obs. used      1916-??-??      last obs. used      2013-02-28      # oppositions      33      planetary ephem.      DE403      condition code      0      fit RMS      0.53      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.187  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.20 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12 diameter diameter 81.61 km 4.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12 rotation period rot_per 7.51 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Stanzel, R.; Schober, H.J. (1980) Astron. Astrophys. Suppl. Ser. 39, 3-5.] [Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.] geometric albedo albedo 0.0554   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12 952 Caia (1916 S61)          Discovered 1916-Oct-27 by Neujmin, G. at Simeis (094) Discovered at Simeis during the First World War while Simeis was not in communication with the Rechen-Institut for long periods of time were given provisional designations containing the Greek letter SIGMA. These are here abbreviated S. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1916 S61 = 1973 WH = A908 EB = A919 GB = A921 RA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 11:24 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin