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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1492505880012309 3.404e-08  
a 3.974259640595457 3.4274e-08 au
q 3.381099052367024 1.26e-07 au
i 2.610235928786623 4.7001e-06 deg
node 183.7355705668739 7.6185e-05 deg
peri 72.89954355663335 7.7683e-05 deg
M 98.73502616271703 1.5602e-05 deg
tp 2458406.808870966287
(2018-Oct-15.30887097)
0.00012249 TDB
period 2893.895080163859
7.92
3.7435e-05
1.025e-07
d
yr
n .1243998106453866 1.6092e-09 deg/d
Q 4.567420228823889 3.9389e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1244  
   data-arc span      16067 days (43.99 yr)  
   first obs. used      1977-02-11  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49322  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:07:17  

Additional Information
 Earth MOID = 2.36589 au 
 Jupiter MOID = .506194 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 13.23   n/a MPCxxxxx  
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. 2020-October); 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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