+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   335 Roberta (A892 RB) Classification: Main-belt Asteroid          SPK-ID: 2000335 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 60 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1730002108392237 2.0329e-08   a 2.475207308940488 3.9394e-09 au q 2.046995922622997 5.0582e-08 au i 5.102747615818579 3.3835e-07 deg node 148.422600608325 7.7354e-06 deg peri 139.8847672859688 7.9631e-06 deg M 40.48482823533048 2.9163e-06 deg tp 2459040.542136312630 (2020-Jul-10.04213631) 1.1412e-05 TDB period 1422.380517282267 3.89 3.3957e-06 9.297e-09 d yr n .2530968300155358 6.0423e-10 deg/d Q 2.90341869525798 4.621e-09 au   Orbit Determination Parameters    # obs. used (total)      3948      data-arc span      46891 days (128.38 yr)      first obs. used      1892-09-01      last obs. used      2021-01-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42498      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:43:17   Additional Information  Earth MOID = 1.03197 au   Jupiter MOID = 2.27778 au   T_jup = 3.455  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.08   n/a E2021B10 IRAS observations used: 17 diameter diameter 97.109 km 0.850 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 12.054 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D.; Roy, R.; Dyvig, R.; Reddy, V.; et al. (2007) Minor Planet Bull. 34, 99.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.] [Pilcher, F.; Martinez, L. (2015) Minor Planet Bull. 42, 239.] geometric albedo albedo 0.049   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.624   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.36, mean=6.66, max.=21.17) deg. U-B UB 0.235   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.36, mean=6.66, max.=21.17) deg. Tholen spectral type spec_T FP   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B B   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) 335 Roberta (A892 RB)          Discovered 1892-Sep-01 by Staus, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A892 RB = 1956 EB1 = 1973 KE = A910 EC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 08:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin