+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   122 Gerda (A872 OA) Classification: Outer Main-belt Asteroid          SPK-ID: 2000122 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03110284142535132 3.9085e-08   a 3.222544402494186 1.2891e-08 au q 3.122314114957256 1.2442e-07 au i 1.640750692364353 4.5293e-06 deg node 178.1247107763967 0.00013849 deg peri 321.1993427046878 0.0001534 deg M 76.3516556086758 6.5687e-05 deg tp 2458752.360990462575 (2019-Sep-25.86099046) 0.00038513 TDB period 2112.986838953902 5.79 1.2678e-05 3.471e-08 d yr n .1703749372041658 1.0223e-09 deg/d Q 3.322774690031116 1.3292e-08 au   Orbit Determination Parameters    # obs. used (total)      3281      data-arc span      54225 days (148.46 yr)      first obs. used      1872-08-01      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49152      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:03:18   Additional Information  Earth MOID = 2.13516 au   Jupiter MOID = 1.66412 au   T_jup = 3.187  [ 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 7.71   n/a E2021B10 IRAS observations used: 9 diameter diameter 70.676 km 0.912 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 10.685 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Di Martino, M.; Blanco, C.; Riccioli, D.; De Sanctis, G. (1994) Icarus 107, 269-275.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Buchheim, R.K.; Roy, R.; Behrend, R. (2007) Minor Planet Bull. 34, 13-14.] [Shevchenko, V.G.; Tungalag, N.; Chiorny, V.G.; Gaftonyuk, N.M.; et al. (2008) ACM 2008, 8106.] [Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Robinson, L. (2011) http://btboar.tripod.com/lightcurves/] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Devogele, M.; Tanga, P.; Bendjoya, P.; Rivet, J.P.; et al. (2017) ArXiv:1707.07503.] geometric albedo albedo 0.297   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.776   0.136 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.47, mean=12.20, max.=15.94) deg. U-B UB 0.410   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.47 deg. Tholen spectral type spec_T ST   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices SMASSII spectral type spec_B L   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) 122 Gerda (A872 OA)          Discovered 1872-Jul-31 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A872 OA = 1948 TQ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 23:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin