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71 Niobe (A861 PA)
Classification: Main-belt Asteroid          SPK-ID: 2000071
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1732058269282425 4.0138e-08  
a 2.755692234831533 7.397e-09 au
q 2.278390282537801 1.1148e-07 au
i 23.265315131 4.0099e-06 deg
node 316.0050396618733 1.1331e-05 deg
peri 267.0701973378162 1.6897e-05 deg
M 350.1222982934546 1.4985e-05 deg
tp 2459046.345625418323
(2020-Jul-15.84562542)
6.9592e-05 TDB
period 1670.877056315607
4.57
6.7276e-06
1.842e-08
d
yr
n .215455708509053 8.6751e-10 deg/d
Q 3.232994187125265 8.6782e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2624  
   data-arc span      57245 days (156.73 yr)  
   first obs. used      1864-01-14  
   last obs. used      2020-10-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4739  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:42  

Additional Information
 Earth MOID = 1.40912 au 
 Jupiter MOID = 2.19819 au 
 T_jup = 3.205 
[ 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 7.1   n/a MPO502153 IRAS observations used: 13
magnitude slope G 0.40   n/a PDS3 (MPC 17257) Fit
diameter diameter 83.42 km 1.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
rotation period rot_per 35.864 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lustig, G.; Dvorak, R. (1975) Acta Phys. Austriaca 43, 89-97.]
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D.; Shepard, M.K.; Harris, A.W.; Pravec, P.; et al. (2006) Minor Planet Bull. 33, 102-103.]
[Sada, P.V.; Warner, B.D. (2007) Minor Planet Bull. 34, 37-38.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 98-99.]
[Warner, B.D. (2011) http://www.minorplanetobserver.com/PDO/PDOLightcurves.htm]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.3052   0.013 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
B-V BV 0.803   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=9.74, mean=12.38, max.=13.81) deg.
U-B UB 0.439   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=9.74, mean=12.38, max.=13.81) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
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)

71 Niobe (A861 PA)          Discovered 1861-Aug-13 by Luther, R. at Dusseldorf
Aug. 14 is date of first measurement.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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