+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   283 Emma (A889 CA) Classification: Main-belt Asteroid          SPK-ID: 2000283 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 84 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1441107310884887 3.8578e-08   a 3.048200198486097 1.0842e-08 au q 2.608921839378189 1.175e-07 au i 7.989497537467758 4.2284e-06 deg node 303.901180591704 2.9827e-05 deg peri 55.25229528718416 3.2833e-05 deg M 24.8509507822558 1.4079e-05 deg tp 2458866.314939641335 (2020-Jan-17.81493964) 7.5906e-05 TDB period 1943.854066284325 5.32 1.0371e-05 2.839e-08 d yr n .1851990878554683 9.8804e-10 deg/d Q 3.487478557594005 1.2404e-08 au   Orbit Determination Parameters    # obs. used (total)      3206      data-arc span      46324 days (126.83 yr)      first obs. used      1894-01-11      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43591      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:23   Additional Information  Earth MOID = 1.61484 au   Jupiter MOID = 1.99994 au   T_jup = 3.207  [ 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 8.6   n/a MPO502155 IRAS observations used: 4 diameter diameter 132.385 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.896 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Stanzel, R. (1978) Astron. Astrophys. Suppl. Ser. 34, 373-376.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Michalowski, T.; Kaasalainen, M.; Polinska, M.; Marciniak, A.; et al. (2006) Astron. Astrophys. 459, 663-668.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/asteroids3D/web.php] [Strabla, L.; Quadri, U.; Girelli, R. (2011) Minor Planet Bull. 38, 169-172.] [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Alton, K.B. (2015) Minor Planet Bull. 42, 146-148.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] geometric albedo albedo 0.023   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.712   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=18.01 deg. U-B UB 0.297   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=18.01 deg. Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 283 Emma (A889 CA)          Discovered 1889-Feb-08 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1979-May-10 06:29 < 00:01 Jupiter 1.99721896304205 1.99721859147816 1.99721933460593 3.56784256769235 3.44692596838607 2444003.770299657 0.520276657464872 85.0542265946016 14.7668660904567 -86.1369973279416 3659538.07891046 T 84 CATAB v2.0f-lin.ifort 2020-Dec-18 01:52:32 2020-Dec-18 01:52 2027-Jul-29 03:01 < 00:01 Jupiter 1.99141689684381 1.99141649845523 1.99141729523227 3.07713467239527 2.93565743373301 2461615.625966324 0.326890864237046 123.721860063201 15.7681458353025 -87.525129505413 3435371.75984482 T 84 CATAB v2.0f-lin.ifort 2020-Dec-18 01:52:32 2020-Dec-18 01:52 Alternate Designations  A889 CA = 1980 FJ12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 21:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin