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287 Nephthys (A889 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000287
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 122 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02290063763289003 1.8819e-08  
a 2.353256549951674 2.486e-09 au
q 2.299365474444006 4.3638e-08 au
i 10.03522514809993 6.7565e-07 deg
node 142.3203708018796 1.8973e-06 deg
peri 119.2765682740172 4.3016e-05 deg
M 204.4558111755213 4.2157e-05 deg
tp 2459770.209722051586
(2022-Jul-09.70972205)
0.00015433 TDB
period 1318.567421184777
3.61
2.0894e-06
5.72e-09
d
yr
n .2730235816660236 4.3264e-10 deg/d
Q 2.407147625459342 2.543e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3641  
   data-arc span      45521 days (124.63 yr)  
   first obs. used      1896-07-26  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46247  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:38:22  

Additional Information
 Earth MOID = 1.29524 au 
 Jupiter MOID = 2.61032 au 
 T_jup = 3.535 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.24   n/a E2021B10 IRAS observations used: 12
magnitude slope G 0.22   n/a PDS3 (MPC 17258) Fit
diameter diameter 59.615 km 1.284 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.605 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Blanco, C.; Di Martino, M.; De Sanctis, G.; Riccioli, D. (1996) Planet. Space Sci. 44, 93-106.]
[Behrend, R. (2000) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Fauerbach, M.; Bennett, T. (2005) Minor Planet Bull. 32, 34-35.]
[Alton, K. (2008) Minor Planet Bull. 35, 33-34.]
[Fauerbach, M.; Marks, S.A.; Lucas, M.P. (2008) Minor Planet Bull. 35, 44-46.]
[Alton, K.B. (2011) Minor Planet Bull. 38, 8-9.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Collaborative Asteroid Lightcurve Link (CALL) (2011) http://www.minorplanetobserver.com/DATA/submissions_results.htm]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.238   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.873   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.92, mean=14.93, max.=21.12) deg.
U-B UB 0.490   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.92, mean=14.93, max.=21.12) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

287 Nephthys (A889 QA)          Discovered 1889-Aug-25 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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