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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 61 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1741129932868917 3.4754e-08  
a 2.757567222216021 9.0846e-09 AU
q 2.27743893896617 9.6342e-08 AU
i 23.26801670101051 3.8335e-06 deg
node 316.039127320173 1.0242e-05 deg
peri 266.6527758679856 1.466e-05 deg
M 279.8601171304036 1.2639e-05 deg
tp 2457372.834939408497
(2015-Dec-16.33493941)
5.9247e-05 JED
period 1672.582656567763
4.58
8.2653e-06
2.263e-08
d
yr
n .2152359996000084 1.0636e-09 deg/d
Q 3.237695505465871 1.0666e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1549  
   data-arc span      55103 days (150.86 yr)  
   first obs. used      1864-01-14  
   last obs. used      2014-11-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53023  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-07 23:42:47  

Additional Information
 Earth MOID = 1.40927 AU 
 T_jup = 3.204 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.30 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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. 2015-Feb); Warner et al., 2009 Published Reference List:
[Warner, B.D.; Shepard, M.K.; Harris, A.W.; Pravec, P.; et al. (2006) Minor Planet Bul. 33, 102-103.]
[Sada, P.V.; Warner, B.D. (2007) Minor Planet Bul. 34, 37-38.]
[Pilcher, F. (2010) Minor Planet Bul. 37, 98-99.]
[Warner, B.D. (2011) http://www.minorplanetobserver.com/PDO/PDOLig htcurves.htm]
geometric albedo albedo 0.3052   0.013 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
B-V BV .803 mag .022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=9.74, mean=12.38, max.=13.81) deg.
U-B UB .439 mag .032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1861-Aug-13 by Luther, R. at Dusseldorf
Aug. 14 is date of first measurement.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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