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2956 Yeomans (1982 HN1)
Classification: Main-belt Asteroid          SPK-ID: 2002956
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09034894694350423 4.4856e-08  
a 2.765649841633472 1.8082e-08 au
q 2.515776290827419 1.2276e-07 au
i 2.868509094223468 5.3203e-06 deg
node 112.2172439871956 0.00011413 deg
peri 124.2493144884588 0.00011974 deg
M 144.3411635702984 3.5441e-05 deg
tp 2456926.931268608918
0.00016648 JED
period 1679.941724889118
n .214293147593415 2.1016e-09 deg/d
Q 3.015523392439526 1.9715e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1516  
   data-arc span      15061 days (41.23 yr)  
   first obs. used      1974-09-14  
   last obs. used      2015-12-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49525  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:45:58  

Additional Information
 Earth MOID = 1.50509 au 
 Jupiter MOID = 1.97758 au 
 T_jup = 3.332 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO347544  
rotation period rot_per 3.4 h n/a LCDB (Rev. 2016-February); 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:
[Aznar, A. (2015) Minor Planet Bul. 42, 4-6.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]
SMASSII spectral type spec_B Sr   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)

2956 Yeomans           Discovered 1982 Apr. 28 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Donald K. Yeomans, celestial mechanician at the Jet Propulsion Laboratory and discipline specialist for the astrometric team of the International Halley Watch. Well known for his orbit determinations that take account of the nongravitational forces acting on comets, he has made a detailed study of the motion of Halley's Comet back to the year -1404 and has analyzed the orbits of meteor showers and their relation to the orbits of parent comets. Citation prepared by S. J. Edberg and Z. Sekanina.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC11158Last Updated: 2005-11-23

[ show close-approach data ]
Alternate Designations
 1982 HN1 = 1950 JG = 1974 RN1 = 1977 DL10 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-01 00:27 UT
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