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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2047129983794164 5.5407e-08  
a 2.378518867371499 8.8441e-09 au
q 1.891605138329866 1.3546e-07 au
i 25.3514547748816 5.1089e-06 deg
node 49.00862303361977 9.5876e-06 deg
peri 141.1697048312691 1.4103e-05 deg
M 350.514234164108 1.03e-05 deg
tp 2459035.804350553869
(2020-Jul-05.30435055)
3.8403e-05 TDB
period 1339.856625102695
3.67
7.473e-06
2.046e-08
d
yr
n .2686854647394883 1.4986e-09 deg/d
Q 2.865432596413132 1.0655e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2092  
   data-arc span      18660 days (51.09 yr)  
   first obs. used      1969-05-16  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36571  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:50:27  

Additional Information
 Earth MOID = .925562 au 
 Jupiter MOID = 2.18982 au 
 T_jup = 3.384 
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Orbital Elements at Epoch 2457168.5 (2015-May-26.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2052158299199684 5.5411e-08  
q 1.890249103638963 1.3551e-07 au
tp 2457695.954439124966
(2016-Nov-03.45443913)
3.6365e-05 TDB
node 49.02363872457377 9.5903e-06 deg
peri 141.1815805589753 1.4077e-05 deg
i 25.35019626758766 5.1087e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2092  
   data-arc span      18660 days (51.09 yr)  
   first obs. used      1969-05-16  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36571  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:50:27  

Additional Information
 Jupiter MOID = 2.18982 au 
 T_jup = 3.384 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.070417537842724E-15 -7.501020607647551E-15 -5.307473841181469E-14 -6.808954992953037E-15 1.449153319843134E-13 -9.740714672756664E-15
q -7.501020607647551E-15 1.836167757221824E-14 1.669248896402668E-13 1.595088372074817E-14 -3.50339949996322E-13 2.444818751840917E-14
tp -5.307473841181469E-14 1.669248896402668E-13 1.322435625826711E-9 -9.648493723443738E-12 3.70417227153025E-10 1.009952207289526E-11
node -6.808954992953037E-15 1.595088372074817E-14 -9.648493723443738E-12 9.197427018011912E-11 -8.574076034206495E-11 -8.069074562372607E-12
peri 1.449153319843134E-13 -3.50339949996322E-13 3.70417227153025E-10 -8.574076034206495E-11 1.981701200219248E-10 9.39692373421939E-12
i -9.740714672756664E-15 2.444818751840917E-14 1.009952207289526E-11 -8.069074562372607E-12 9.39692373421939E-12 2.609831871032579E-11

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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 24. h n/a LCDB (Rev. 2019-August); 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, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.172   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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 ]
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