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4276 Clifford (1981 XA)
Classification: Mars-crossing Asteroid          SPK-ID: 2004276
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037700938248211 6.6764e-08  
a 2.00990445325407 5.413e-09 au
q 1.600346034235562 1.3654e-07 au
i 21.0307479231123 7.0833e-06 deg
node 76.88133814425071 1.2565e-05 deg
peri 3.507949894730013 1.9101e-05 deg
M 172.6841174045839 1.4523e-05 deg
tp 2458501.257625636658
(2019-Jan-17.75762564)
4.0866e-05 TDB
period 1040.786248741787
2.85
4.2045e-06
1.151e-08
d
yr
n .3458923486308607 1.3973e-09 deg/d
Q 2.419462872272577 6.516e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1532  
   data-arc span      14201 days (38.88 yr)  
   first obs. used      1981-10-05  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42468  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:52:56  

Additional Information
 Earth MOID = .616181 au 
 Jupiter MOID = 2.85482 au 
 T_jup = 3.725 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457091.5 (2015-Mar-10.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037179735301932 6.6673e-08  
q 1.600372765381881 1.3634e-07 au
tp 2457460.857912990949
(2016-Mar-13.35791299)
3.8852e-05 TDB
node 76.91183745777857 1.2571e-05 deg
peri 3.494633166406904 1.9114e-05 deg
i 21.026384958972 7.0822e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1532  
   data-arc span      14201 days (38.88 yr)  
   first obs. used      1981-10-05  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42468  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:52:56  

Additional Information
 Jupiter MOID = 2.85482 au 
 T_jup = 3.725 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.445327385551403E-15 -9.086734761475397E-15 -1.934577373382035E-12 4.451844010700466E-14 -7.422582337392417E-13 -4.745705477151194E-14
q -9.086734761475397E-15 1.858777271904345E-14 3.962852987086411E-12 -9.125059251194774E-14 1.518555683415906E-12 9.744983732072943E-14
tp -1.934577373382035E-12 3.962852987086411E-12 1.509455794217209E-9 -2.137904827365617E-11 5.757734764585437E-10 2.355144045899312E-11
node 4.451844010700466E-14 -9.125059251194774E-14 -2.137904827365617E-11 1.580406855953347E-10 -1.544073933432379E-10 -5.353511963140777E-11
peri -7.422582337392417E-13 1.518555683415906E-12 5.757734764585437E-10 -1.544073933432379E-10 3.653316131015879E-10 5.830643036789212E-11
i -4.745705477151194E-14 9.744983732072943E-14 2.355144045899312E-11 -5.353511963140777E-11 5.830643036789212E-11 5.01570224302227E-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 14.7   n/a MPO473825  
diameter diameter 4.708 km 1.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 3.23935 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 0.087   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4276 Clifford (1981 XA)          Discovered 1981-Dec-02 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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