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980 Anacostia (A921 WG)
Classification: Main-belt Asteroid          SPK-ID: 2000980
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2031920487272595 4.0341e-08  
a 2.739249960624978 9.7885e-09 au
q 2.182656149149524 1.1181e-07 au
i 15.90835813368822 5.371e-06 deg
node 285.8108961990758 1.6702e-05 deg
peri 69.88477935770663 2.1651e-05 deg
M 262.1362709472403 1.5238e-05 deg
tp 2459450.658217590416
(2021-Aug-24.15821759)
7.1442e-05 TDB
period 1655.945056469109
4.53
8.8761e-06
2.43e-08
d
yr
n .2173985172959848 1.1653e-09 deg/d
Q 3.295843772100433 1.1777e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2163  
   data-arc span      33301 days (91.17 yr)  
   first obs. used      1929-04-15  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36821  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:56  

Additional Information
 Earth MOID = 1.233 au 
 Jupiter MOID = 2.30029 au 
 T_jup = 3.266 
[ 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 7.8   n/a MPO473776 IRAS observations used: 21
magnitude slope G 0.06   n/a PDS3 (MPC 17260) Fit
diameter diameter 74.679 km 0.652 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 20.117 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[McFaul, T.G. (1981) Minor Planet Bull. 8, 19-21.]
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marciniak, A.; Pilcher, F.; Santana-Ros, T.; Oszkiewicz; Kankiewicz, P. (2014) ACM 2014, Poster 57.]
[Devogele, M.; Tanga, P.; Bendjoya, P.; Rivet, J.P.; et al. (2017) ArXiv:1707.07503.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.229   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.915   0.006 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=7.40, mean=16.70, max.=25.43) deg.
U-B UB 0.532   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=7.40, mean=15.41, max.=25.43) deg.
Tholen spectral type spec_T SU   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 EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

980 Anacostia (A921 WG)          Discovered 1921-Nov-21 by Peters, G. H. at Washington
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A921 WG = A917 YC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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