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JPL Small-Body Database Browser
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116 Sirona (A871 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000116
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 106 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1418404393758175 3.9848e-08  
a 2.767101015239276 8.8911e-09 au
q 2.374614191440467 1.1187e-07 au
i 3.563923456336214 4.4843e-06 deg
node 63.71200251752276 7.0627e-05 deg
peri 94.41506310524906 7.2445e-05 deg
M 307.9930632103234 1.7012e-05 deg
tp 2459243.381659307788
(2021-Jan-28.88165931)
7.9822e-05 TDB
period 1681.264130291171
4.60
8.1032e-06
2.219e-08
d
yr
n .2141245944131652 1.032e-09 deg/d
Q 3.159587839038086 1.0152e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2816  
   data-arc span      53804 days (147.31 yr)  
   first obs. used      1872-12-23  
   last obs. used      2020-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49208  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:58:47  

Additional Information
 Earth MOID = 1.38702 au 
 Jupiter MOID = 1.83004 au 
 T_jup = 3.321 
[ 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 7.8   n/a MPO502153 IRAS observations used: 5
diameter diameter 71.70 km 5.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 12.028 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.2560   0.047 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
B-V BV 0.873   0.073 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.71, mean=12.00, max.=18.29) deg.
U-B UB 0.429   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.71, mean=12.00, max.=18.29) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sk   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)

116 Sirona (A871 RA)          Discovered 1871-Sep-08 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A871 RA = 1954 UC3 = 1998 EK13 = 1998 ES21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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