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132 Aethra (A873 LA)
Classification: Mars-crossing Asteroid          SPK-ID: 2000132
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3894858389290027 1.1028e-08  
a 2.608046067805568 4.1921e-09 au
q 1.592249057120829 2.8503e-08 au
i 24.99323777801464 4.6876e-07 deg
node 258.3920914982715 1.4995e-06 deg
peri 255.1856865927172 1.8516e-06 deg
M 52.82293492306197 1.2805e-06 deg
tp 2458974.768929438269
(2020-May-05.26892944)
5.0749e-06 TDB
period 1538.40723770054
4.21
3.7092e-06
1.016e-08
d
yr
n .2340082594372688 5.642e-10 deg/d
Q 3.623843078490306 5.8248e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2618  
   data-arc span      53969 days (147.76 yr)  
   first obs. used      1873-06-14  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:54:15  

Additional Information
 Earth MOID = .772917 au 
 Jupiter MOID = 2.19276 au 
 T_jup = 3.177 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457364.5 (2015-Dec-08.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .390367130803738 1.1031e-08  
q 1.589561638444189 2.8552e-08 au
tp 2457437.049546324315
(2016-Feb-18.54954632)
3.5958e-06 TDB
node 258.4167439420994 1.5001e-06 deg
peri 255.2214711410499 1.8463e-06 deg
i 24.99600147657077 4.6863e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2618  
   data-arc span      53969 days (147.76 yr)  
   first obs. used      1873-06-14  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:54:15  

Additional Information
 Jupiter MOID = 2.19276 au 
 T_jup = 3.177 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.216905130634497E-16 -3.13714732458792E-16 2.338053615832276E-14 -1.725194380865028E-16 1.069901686809213E-14 -2.462515132588323E-15
q -3.13714732458792E-16 8.15199842765384E-16 -6.143610927920726E-14 4.67220987480598E-16 -2.831078356809557E-14 6.402412863453234E-15
tp 2.338053615832276E-14 -6.143610927920726E-14 1.293010403186197E-11 1.427013602855738E-12 3.858007744308491E-12 -2.428601430075365E-13
node -1.725194380865028E-16 4.67220987480598E-16 1.427013602855738E-12 2.250237872028112E-12 -1.598909468352537E-12 -5.594858146494681E-14
peri 1.069901686809213E-14 -2.831078356809557E-14 3.858007744308491E-12 -1.598909468352537E-12 3.408802682625756E-12 -6.177694523400488E-14
i -2.462515132588323E-15 6.402412863453234E-15 -2.428601430075365E-13 -5.594858146494681E-14 -6.177694523400488E-14 2.19617034266031E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.01   n/a MPCxxxxx  
diameter diameter 42.87 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
rotation period rot_per 5.1684 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2006) IAU 2006, poster paper.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[McDonald, D. (2012) Minor Planet Bull. 39, 105.]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2018) Minor Planet Bull. 45, 380-386.]
geometric albedo albedo 0.1990   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
B-V BV 0.673   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=7.45, mean=12.34, max.=27.24) deg.
U-B UB 0.188   0.043 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=7.45, mean=16.08, max.=27.24) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xe   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)

132 Aethra (A873 LA)          Discovered 1873-Jun-13 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A873 LA = 1949 MD = 1953 LF = A922 XB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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