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JPL Small-Body Database Browser
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15860 Siran (1996 HO)
Classification: Main-belt Asteroid          SPK-ID: 2015860
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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09489436537440162 3.5731e-08  
a 2.375731884479682 8.9853e-09 au
q 2.150288315002251 8.862e-08 au
i 7.902992185675603 4.1299e-06 deg
node 123.2753682807643 2.9855e-05 deg
peri 299.4865201066873 3.9823e-05 deg
M 358.3439805218039 2.7248e-05 deg
tp 2459006.652583356160
0.00010124 TDB
period 1337.50238893959
n .2691583977546525 1.527e-09 deg/d
Q 2.601175453957113 9.838e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1211  
   data-arc span      9692 days (26.54 yr)  
   first obs. used      1993-07-12  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56417  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 21:29:40  

Additional Information
 Earth MOID = 1.17659 au 
 Jupiter MOID = 2.63399 au 
 T_jup = 3.523 
[ 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 14.7   n/a MPO256980  
diameter diameter 2.426 km 0.753 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 10.532 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.396   0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

15860 Siráň           Discovered 1996 Apr. 20 by A. Galád and D. Kalmančok at Modra.
Slovak geophysicist Gustáv Siráň (1934-2000) was a professor at Comenius University, Bratislava. From 1981 to 1989 he was head of the department of astronomy, geophysics and meteorology, and during this time the Astronomical and Geophysical Observatory in Modra was built.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1996 HO = 1997 PB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-May-31 18:02 UT
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