+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 540 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2559037949729769 2.3931e-08   a 1.430558085700207 1.0694e-09 au q 1.064472842640247 3.431e-08 au i 8.705526701293609 2.781e-06 deg node 246.3282712980688 1.6701e-05 deg peri 338.3691549232982 1.7717e-05 deg M 303.4484504127924 6.2649e-06 deg tp 2459298.674495987628 (2021-Mar-25.17449599) 1.0899e-05 TDB period 624.9664034589254 1.71 7.0079e-07 1.919e-09 d yr n .5760309642367204 6.4592e-10 deg/d Q 1.796643328760167 1.3431e-09 au   Orbit Determination Parameters    # obs. used (total)      3673      data-arc span      17520 days (47.97 yr)      first obs. used      1973-03-10      last obs. used      2021-02-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41237      source      ORB      producer      Otto Matic      solution date      2021-Feb-27 05:51:21   Additional Information  Earth MOID = .0611847 au   Jupiter MOID = 3.19376 au   T_jup = 4.639  [ 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. 2020-October); 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, 458-503.] [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 ] 2021-Mar-01 21:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin