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10395 Jirkahorn (1997 SZ1)
Classification: Main-belt Asteroid          SPK-ID: 2010395
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1192265493868462 2.7909e-08  
a 2.44420362308283 7.7402e-09 au
q 2.152789659103836 6.8986e-08 au
i 2.711197083150787 4.0216e-06 deg
node 200.2898354195347 5.5418e-05 deg
peri 232.3528500529723 5.9512e-05 deg
M 347.8199146958383 1.8815e-05 deg
tp 2459247.722864916033
7.2871e-05 TDB
period 1395.739926711624
n .2579277078131334 1.2252e-09 deg/d
Q 2.735617587061823 8.6631e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1926  
   data-arc span      11008 days (30.14 yr)  
   first obs. used      1991-01-22  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49481  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 22:03:53  

Additional Information
 Earth MOID = 1.16819 au 
 Jupiter MOID = 2.50359 au 
 T_jup = 3.488 
[ 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 14.47   n/a MPCxxxxx  
diameter diameter 7.647 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 3.670 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.052   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

10395 Jirkahorn           Discovered 1997 Sept. 23 by M. Wolf and P. Pravec at Ondřejov.
Named in memory of Jiří Horn (1941-1994), an astronomer at the Ondřejov Observatory. He worked in stellar astrophysics, observational astronomy and data reduction, making important contributions to all of them. He was a member of the team that in the late 1960s made the first calculations of the evolution of close binaries with mass loss. He played an important role in the commissioning phase of the 2-m telescope at Ondřejov. He created the user-friendly software SPEFO for the reduction of stellar spectra that is still in use by many astronomers. Name proposed by the discoverers, following a suggestion by P. Koubský, who also prepared the citation.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1997 SZ1 = 1991 BQ4 = 1993 RZ5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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