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4231 Fireman (1976 WD)
Classification: Main-belt Asteroid          SPK-ID: 2004231
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06552449087247267 1.8442e-08  
a 2.259869669874321 6.5291e-09 au
q 2.111792860317663 4.2242e-08 au
i 8.590991368252615 2.3357e-07 deg
node 261.046130714925 4.8746e-06 deg
peri 76.828355374929 8.862e-06 deg
M 88.43898420251722 7.9144e-06 deg
tp 2458895.665047460088
(2020-Feb-16.16504746)
2.7254e-05 TDB
period 1240.862091575726
3.40
5.3776e-06
1.472e-08
d
yr
n .2901208784151419 1.2573e-09 deg/d
Q 2.407946479430978 6.957e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2436  
   data-arc span      16189 days (44.32 yr)  
   first obs. used      1976-11-20  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:29:18  

Additional Information
 Earth MOID = 1.11876 au 
 Jupiter MOID = 2.80421 au 
 T_jup = 3.603 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.39   n/a MPCxxxxx  
diameter diameter 13.28 km 1.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 28.0 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:
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0437   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

4231 Fireman (1976 WD)          Discovered 1976-Nov-11 by Harvard Observatory at Harvard
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1976 WD = 1976 YV3 = 1977 AT = 1979 SP10 = 1986 XK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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