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30947 (1994 JW)
Classification: Main-belt Asteroid          SPK-ID: 2030947
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1397105169425886 3.4905e-08  
a 2.686066011962756 1.1468e-08 au
q 2.310794340889522 9.3499e-08 au
i 13.59775875670545 4.8481e-06 deg
node 65.393976150556 1.8457e-05 deg
peri 30.6653306758816 2.7414e-05 deg
M 70.6111539945007 1.9087e-05 deg
tp 2458685.112659008488
(2019-Jul-20.61265901)
8.4974e-05 TDB
period 1607.953366203123
4.40
1.0298e-05
2.819e-08
d
yr
n .2238870899907202 1.4338e-09 deg/d
Q 3.06133768303599 1.307e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1842  
   data-arc span      9565 days (26.19 yr)  
   first obs. used      1994-05-04  
   last obs. used      2020-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44581  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:03:40  

Additional Information
 Earth MOID = 1.33698 au 
 Jupiter MOID = 2.21053 au 
 T_jup = 3.320 
[ 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 13.5   n/a MPO385005  
diameter diameter 5.997 km 0.337 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 17.0185 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.235   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

30947 (1994 JW)          Discovered 1994-May-04 by Helin, E. F. at Palomar
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1994 JW = 1998 GT1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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