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2161 Grissom (1963 UD)
Classification: Main-belt Asteroid          SPK-ID: 2002161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629306075310174 3.7878e-08  
a 2.746717436650528 1.2001e-08 au
q 2.299193095981019 1.0517e-07 au
i 7.305852759308579 3.9334e-06 deg
node 126.41201537693 3.1206e-05 deg
peri 249.4288745531406 3.3158e-05 deg
M 169.4116440919803 1.3384e-05 deg
tp 2458218.043576804382
(2018-Apr-09.54357680)
5.9747e-05 TDB
period 1662.721083076704
4.55
1.0897e-05
2.983e-08
d
yr
n .2165125610447272 1.419e-09 deg/d
Q 3.194241777320037 1.3956e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2522  
   data-arc span      32385 days (88.67 yr)  
   first obs. used      1931-10-17  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42237  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:41:45  

Additional Information
 Earth MOID = 1.31222 au 
 Jupiter MOID = 2.30333 au 
 T_jup = 3.316 
[ 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 12.2   n/a MPO337264  
diameter diameter 15.857 km 0.115 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.0633 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:
[Vinson, R.; Moore, R.; Ditteon, R. (2014) Minor Planet Bull. 41, 169-170.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.074   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B C   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)

2161 Grissom           Discovered 1963 Oct. 17 at the Goethe Link Observatory, Indiana University.
Named in memory of Virgil I. "Gus" Grissom (1926-1967), one of the seven Mercury astronauts. On 1961 July 21, as pilot of the Mercury-Redstone 4 suborbital mission, he became the second American in space. In 1965 he commanded a three-orbit mission, the first manned Gemini flight. As command pilot of Apollo 1, he lost his life in the tragic fire in that spacecraft. Name proposed by D. Owings and F. K. Edmondson. Citation prepared by Muriel M. Thorne, NASA.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5848Last Updated: 2006-03-21

[ show close-approach data ]
Alternate Designations
 1963 UD = 1931 UN = 1976 OK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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