+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   545 Messalina (A904 TC) Classification: Outer Main-belt Asteroid          SPK-ID: 2000545 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 56 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1699396788432282 2.0669e-08   a 3.20237202225593 1.0547e-08 au q 2.658161949257218 6.9677e-08 au i 11.20559447335114 1.2225e-06 deg node 333.5988223268451 4.0696e-06 deg peri 331.0135812027815 7.1231e-06 deg M 220.2017665907197 7.0874e-06 deg tp 2460013.340405436035 (2023-Mar-09.84040544) 4.2543e-05 TDB period 2093.177709193764 5.73 1.0341e-05 2.831e-08 d yr n .1719873083010532 8.4965e-10 deg/d Q 3.746582095254642 1.2339e-08 au   Orbit Determination Parameters    # obs. used (total)      3413      data-arc span      42532 days (116.45 yr)      first obs. used      1904-10-03      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40092      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:03:47   Additional Information  Earth MOID = 1.64799 au   Jupiter MOID = 1.59075 au   T_jup = 3.142  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.81   n/a E2021B10 IRAS observations used: 11 diameter diameter 112.631 km 1.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.2 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Di Martino, M. (1984) Icarus 60, 541-546.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1990) Icarus 86, 402-447.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.041   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.686   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=13.94, mean=14.07, max.=14.21) deg. U-B UB 0.343   0.058 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.94 deg. Tholen spectral type spec_T CD   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 545 Messalina (A904 TC)          Discovered 1904-Oct-03 by Gotz, P. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A904 TC = 1949 YH = 1973 YO4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 09:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin