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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2033105561332015 1.6167e-08  
a 2.009751070546057 4.6877e-09 au
q 1.601147462704041 3.3547e-08 au
i 21.01924720431652 4.8593e-07 deg
node 76.84996911805391 2.127e-06 deg
peri 3.654440643413309 4.6264e-06 deg
M 309.4727023748782 4.9746e-06 deg
tp 2459542.561380276742
1.4658e-05 TDB
period 1040.667112057936
n .3459319467568204 1.2103e-09 deg/d
Q 2.418354678388073 5.6407e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1576  
   data-arc span      14201 days (38.88 yr)  
   first obs. used      1981-10-05  
   last obs. used      2020-08-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42347  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:22:12  

Additional Information
 Earth MOID = .616901 au 
 Jupiter MOID = 2.85686 au 
 T_jup = 3.725 
[ 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 14.66   n/a MPCxxxxx  
diameter diameter 4.708 km 1.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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] (  
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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2130-Mar-05 20:06 < 00:01 Mars 0.0660124766834941 0.066009717273432 0.0660152364518066 8.78258897487099 8.78209515357227 2499090.337707937 0.536646739629618 278.937542418405 4.41559301329391 60.4524910996549 1961308.87451531 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 10:23:17 2021-Aug-25 10:23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2021-Sep-27 11:56 UT
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