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838 Seraphina (A916 SL)
Classification: Main-belt Asteroid          SPK-ID: 2000838
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1310074640373318 7.8138e-09  
a 2.898930650570205 8.4605e-09 au
q 2.51914909761891 2.1006e-08 au
i 10.42175489343075 5.9448e-07 deg
node 240.0547318900335 1.8742e-06 deg
peri 117.1778990327931 8.8146e-06 deg
M 55.12225612905663 7.6111e-06 deg
tp 2458924.455149481432
(2020-Mar-15.95514948)
3.7994e-05 TDB
period 1802.831617668497
4.94
7.8924e-06
2.161e-08
d
yr
n .1996858699791211 8.7418e-10 deg/d
Q 3.2787122035215 9.5689e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3794  
   data-arc span      38167 days (104.50 yr)  
   first obs. used      1916-09-24  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39096  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:35:48  

Additional Information
 Earth MOID = 1.53552 au 
 Jupiter MOID = 2.28706 au 
 T_jup = 3.250 
[ 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 10.19   n/a MPCxxxxx IRAS observations used: 8
diameter diameter 58.095 km 0.496 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 15.67 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.048   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.703   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.47, mean=4.46, max.=7.45) deg.
U-B UB 0.324   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.47, mean=4.46, max.=7.45) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

838 Seraphina (A916 SL)          Discovered 1916-Sep-24 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A916 SL = 2019 FC5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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