+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1943 Anteros (1973 EC) Classification: Amor [NEO]          SPK-ID: 2001943 [ 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 491 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2559951669145157 2.415e-08   a 1.430462184127818 1.078e-09 au q 1.064270778537114 3.4606e-08 au i 8.706205394265611 2.8366e-06 deg node 246.3297680537982 1.6789e-05 deg peri 338.3739691383548 1.7822e-05 deg M 188.2367863843016 6.3885e-06 deg tp 2459298.654010126509 (2021-Mar-25.15401013) 1.1166e-05 TDB period 624.9035598838683 1.71 7.064e-07 1.934e-09 d yr n .5760888929275778 6.5122e-10 deg/d Q 1.796653589718521 1.354e-09 au   Orbit Determination Parameters    # obs. used (total)      3458      data-arc span      17113 days (46.85 yr)      first obs. used      1973-03-10      last obs. used      2020-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40946      source      ORB      producer      Otto Matic      solution date      2020-Aug-13 05:59:32   Additional Information  Earth MOID = .0623068 au   Jupiter MOID = 3.19489 au   T_jup = 4.640  [ 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 15.6   n/a MPO492773   diameter diameter 2.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   rotation period rot_per 2.86923 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1990) Icarus 86, 402-447.] [Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.] [Koehn, B.W.; Bowell, E.L.G.; Skiff, B.A.; Sanborn, J.J.; et al. (2014) Minor Planet Bull. 41, 286-300.] [Warner, B.D. (2014) Minor Planet Bull. 41, 157-168.] [Warner, B.D. (2015) Minor Planet Bull. 42, 41-53.] [Warner, B.D.; Benishek, V.; Harris, A.W. (2017) Minor Planet Bull. 44, 186-188.] [Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46-4, in press.] [Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 144-152.] geometric albedo albedo 0.17   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV 0.841   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=15.92, mean=16.51, max.=17.10) deg. U-B UB 0.444   0.061 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=15.92, mean=16.51, max.=17.10) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B L   n/a Binzel et al. (2001) Icarus 151, 139-149   1943 Anteros (1973 EC)          Discovered 1973-Mar-13 by Gibson, J. at El Leoncito Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-14 20:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin