Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
1987 Kaplan (1952 RH)
Classification: Main-belt Asteroid          SPK-ID: 2001987
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2275466548813688 2.1158e-08  
a 2.381482608135571 6.7282e-09 au
q 1.839584206996164 5.0115e-08 au
i 23.65175975571028 5.5495e-07 deg
node 314.1901711325854 3.2482e-06 deg
peri 38.34822589398855 1.0244e-05 deg
M 253.0305560266083 6.9336e-06 deg
tp 2459795.365786820631
2.6651e-05 TDB
period 1342.361686867747
n .2681840546567 1.1365e-09 deg/d
Q 2.923381009274978 8.2592e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2527  
   data-arc span      25146 days (68.85 yr)  
   first obs. used      1952-09-11  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .34359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:14:51  

Additional Information
 Earth MOID = .866699 au 
 Jupiter MOID = 2.56066 au 
 T_jup = 3.392 
[ 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 11.64   n/a MPO614063  
diameter diameter 13.017 km 0.159 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 9.453 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2001) Minor Planet Bull. 28, 40-41.]
[Warner, B.D. (2011) Minor Planet Bull. 38, 63-65.]
[Warner, B.D (2012) Minor Planet Bull. 39, 69-80.]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
[Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2018) Icarus 309, 297-337.]
[Behrend, R. (2020) Observatoire de Geneve web site,]
geometric albedo albedo 0.262   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

1987 Kaplan           Discovered 1952 Sept. 11 by P. F. Shajn at Simeis.
Named in memory of Samuil Aronovich Kaplan (1921-1978), head of the astrophysics department at the Lvov Observatory from 1948 to 1961 and subsequently a staff member of the Scientific Research Radiophysics Institute in Gorkij. He contributed extensively to a wide range of astrophysical topics, including white dwarfs, interstellar matter, radiative transfer, solar radiation, pulsars and galactic nuclei.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5358Last Updated: 2006-03-21
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Sep-25 07:31 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin