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4255 Spacewatch (1986 GW)
Classification: Outer Main-belt Asteroid          SPK-ID: 2004255
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 .1494608685937913 3.4388e-08  
a 3.974897541232986 3.4596e-08 au
q 3.380805902148978 1.2811e-07 au
i 2.610099981895438 4.7099e-06 deg
node 183.7355968495229 7.9096e-05 deg
peri 72.95412614854273 8.0553e-05 deg
M 73.7767938685393 1.5496e-05 deg
tp 2458407.295260767305
(2018-Oct-15.79526077)
0.00012251 TDB
period 2894.591848275423
7.92
3.7791e-05
1.035e-07
d
yr
n .1243698658981871 1.6237e-09 deg/d
Q 4.568989180316994 3.9767e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1221  
   data-arc span      15968 days (43.72 yr)  
   first obs. used      1977-02-11  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49437  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:53:05  

Additional Information
 Earth MOID = 2.36723 au 
 Jupiter MOID = .505942 au 
 T_jup = 3.036 
[ 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 13.2   n/a MPO365298  
diameter diameter 15.111 km 0.285 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 20. 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:
[Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.]
geometric albedo albedo 0.030   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

4255 Spacewatch (1986 GW)          Discovered 1986-Apr-04 by Spacewatch at Kitt Peak
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1986 GW = 1977 CN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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