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2830 Greenwich (1980 GA)
Classification: Main-belt Asteroid          SPK-ID: 2002830
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2049080654335832 6.0442e-08  
a 2.378870136623998 1.0049e-08 au
q 1.891420459010651 1.4587e-07 au
i 25.3534274359435 6.9847e-06 deg
node 49.01458374097466 9.8932e-06 deg
peri 141.1418140807607 1.542e-05 deg
M 243.0934135877872 1.3065e-05 deg
tp 2459035.702125040578
5.0073e-05 TDB
period 1340.153449200712
n .268625954896963 1.7021e-09 deg/d
Q 2.866319814237345 1.2108e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1558  
   data-arc span      18467 days (50.56 yr)  
   first obs. used      1969-05-16  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3957  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:21:01  

Additional Information
 Earth MOID = .925666 au 
 Jupiter MOID = 2.1899 au 
 T_jup = 3.383 
[ 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 12.5   n/a MPO502180  
diameter diameter 7.892 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 24. h n/a LCDB (Rev. 2019-January); Warner et al., 2009 lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site,]
geometric albedo albedo 0.172   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.867   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.27 deg.
U-B UB 0.441   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.27 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices

2830 Greenwich (1980 GA)          Discovered 1980-Apr-14 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1980 GA = 1969 KC = 1978 VZ14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Jan-25 14:32 UT
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