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JPL Small-Body Database Browser
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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 | 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 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1308904922838852 3.077e-08  
a 2.898295835539348 1.0666e-08 au
q 2.518936466841268 8.9482e-08 au
i 10.42261589778919 3.908e-06 deg
node 240.053144467995 1.9419e-05 deg
peri 117.1042248616116 2.4624e-05 deg
M 15.2480024557756 1.6007e-05 deg
tp 2458924.165133825308
7.9989e-05 TDB
period 1802.239467273973
n .1997514794992964 1.1027e-09 deg/d
Q 3.277655204237428 1.2062e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3021  
   data-arc span      37724 days (103.28 yr)  
   first obs. used      1916-09-24  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42311  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:38:34  

Additional Information
 Earth MOID = 1.53687 au 
 Jupiter MOID = 2.28773 au 
 T_jup = 3.251 
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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 10.1   n/a MPO502161 IRAS observations used: 8
diameter diameter 58.095 km 0.496 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 15.67 h n/a LCDB (Rev. 2019-August); 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,]
geometric albedo albedo 0.048   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1966-Sep-24 13:10 < 00:01 Ceres 0.0418718894963532 0.041869207854824 0.0418745713822746 7.56869034555341 7.56868901249736 2439393.048341623 0.36927181450388 210.495003205758 28.0415122841468 -51.2936138095696 174884.919217585 T 74 CATAB v2.0f-lin.ifort 2020-Feb-22 15:38:47 2020-Feb-22 15:38

Alternate Designations
 A916 SL = 2019 FC5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-27 09:03 UT
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