+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   272 Antonia (A888 CA) Classification: Main-belt Asteroid          SPK-ID: 2000272 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02814573769734377 3.0216e-08   a 2.776974309140613 9.0302e-09 au q 2.698814318643279 8.5854e-08 au i 4.432578013768024 4.1046e-06 deg node 37.31714410863869 4.6853e-05 deg peri 69.10163762236228 9.2805e-05 deg M 240.8571285260634 8.0366e-05 deg tp 2459559.899123915433 (2021-Dec-11.39912392) 0.0003775 TDB period 1690.270530819042 4.63 8.2447e-06 2.257e-08 d yr n .212983657607494 1.0389e-09 deg/d Q 2.855134299637947 9.2843e-09 au   Orbit Determination Parameters    # obs. used (total)      3064      data-arc span      37327 days (102.20 yr)      first obs. used      1918-09-06      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4328      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:20   Additional Information  Earth MOID = 1.71965 au   Jupiter MOID = 2.16454 au   T_jup = 3.330  [ hide covariance matrix ] Orbital Elements at Epoch 2456316.5 (2013-Jan-24.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02758263450269048 2.942e-08   q 2.700494867572019 8.36e-08 au tp 2456147.909954703284 (2012-Aug-08.40995470) 0.00039043 TDB node 37.42386726944698 4.6716e-05 deg peri 62.78793287323752 9.5455e-05 deg i 4.440336129698336 4.1103e-06 deg   Orbit Determination Parameters    # obs. used (total)      3064      data-arc span      37327 days (102.20 yr)      first obs. used      1918-09-06      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4328      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:20   Additional Information  Jupiter MOID = 2.16454 au   T_jup = 3.330  Orbit Covariance (6×6)   e q tp node peri i e 8.65565020610051E-16 -2.446475467635386E-15 8.016634883007516E-13 9.635964609025744E-16 1.942889789993146E-13 5.206816100129098E-17 q -2.446475467635386E-15 6.988937070023616E-15 -1.993724874601611E-12 -4.453601264612311E-15 -4.885819073959051E-13 -4.024871062780561E-17 tp 8.016634883007516E-13 -1.993724874601611E-12 1.524339031055861E-7 4.778679358294758E-11 3.251374363215138E-8 4.31334351506747E-12 node 9.635964609025744E-16 -4.453601264612311E-15 4.778679358294758E-11 2.182401345450121E-9 -2.165480930216547E-9 -6.13260701537979E-11 peri 1.942889789993146E-13 -4.885819073959051E-13 3.251374363215138E-8 -2.165480930216547E-9 9.111739271636083E-9 6.207408949886496E-11 i 5.206816100129098E-17 -4.024871062780561E-17 4.31334351506747E-12 -6.13260701537979E-11 6.207408949886496E-11 1.689462644551947E-11 [ 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 10.6   n/a MPO435697   diameter diameter 26.870 km 0.286 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.8548 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pilcher, F. (2008) Minor Planet Bull. 35, 135-138.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.128   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B X   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) 272 Antonia (A888 CA)          Discovered 1888-Feb-04 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A888 CA = 1944 FE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 07:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin