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30945 (1994 GW9)
Classification: Main-belt Asteroid          SPK-ID: 2030945
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .084408250145388 3.4717e-08  
a 3.064421029846788 1.6624e-08 au
q 2.805758613008693 1.1309e-07 au
i 10.15862619481307 4.785e-06 deg
node 33.31448550715688 1.9226e-05 deg
peri 280.9509215776416 3.3685e-05 deg
M 296.1531652419694 2.7674e-05 deg
tp 2459744.002512484408
(2022-Jun-13.50251248)
0.00015057 TDB
period 1959.390860463165
5.36
1.5944e-05
4.365e-08
d
yr
n .1837305701808278 1.4951e-09 deg/d
Q 3.323083446684884 1.8027e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1770  
   data-arc span      14396 days (39.41 yr)  
   first obs. used      1982-01-26  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49036  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 06:47:43  

Additional Information
 Earth MOID = 1.81524 au 
 Jupiter MOID = 1.9461 au 
 T_jup = 3.203 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457454.5 (2016-Mar-07.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08292552681332517 3.4625e-08  
q 2.811310726746773 1.1267e-07 au
tp 2457780.981268956296
(2017-Jan-27.48126896)
0.00015454 TDB
node 33.34357464470371 1.9226e-05 deg
peri 280.5606337339218 3.4132e-05 deg
i 10.15758496393188 4.7841e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1770  
   data-arc span      14396 days (39.41 yr)  
   first obs. used      1982-01-26  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49036  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 06:47:43  

Additional Information
 Jupiter MOID = 1.9461 au 
 T_jup = 3.203 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.198889474859602E-15 -3.870560451827418E-15 1.99662552079821E-12 -1.161953975867368E-15 3.827763416427488E-13 1.99821687146191E-16
q -3.870560451827418E-15 1.269460418049213E-14 -6.375700710456721E-12 3.744962873074927E-15 -1.229885431031594E-12 8.687760569173861E-16
tp 1.99662552079821E-12 -6.375700710456721E-12 2.388396891151871E-8 -2.033899931466534E-12 4.370118447282412E-9 -4.374317657450184E-12
node -1.161953975867368E-15 3.744962873074927E-15 -2.033899931466534E-12 3.696212196919185E-10 -3.63965604730404E-10 -2.659064757569955E-11
peri 3.827763416427488E-13 -1.229885431031594E-12 4.370118447282412E-9 -3.63965604730404E-10 1.165013681156043E-9 2.54483797176765E-11
i 1.99821687146191E-16 8.687760569173861E-16 -4.374317657450184E-12 -2.659064757569955E-11 2.54483797176765E-11 2.288739550039364E-11

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 13.46   n/a MPO614063  
diameter diameter 7.944 km 0.288 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.38 h n/a LCDB (Rev. 2020-October); 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:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.147   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30945 (1994 GW9)          Discovered 1994-Apr-14 by Gilmore, A. C., Kilmartin, P. M. at Lake Tekapo
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 GW9 = 1982 BM5 = 1999 GV40 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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