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2807 Hard (1969 TH6)
Classification: Main-belt Asteroid          SPK-ID: 2002807
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1829208184640786 2.074e-08  
a 2.79253806340719 1.1644e-08 au
q 2.281724715256654 6.0357e-08 au
i 7.865352732232314 1.3972e-06 deg
node 28.24834125281215 1.444e-05 deg
peri 93.08217211813658 1.5224e-05 deg
M 265.562862619508 9.5152e-06 deg
tp 2459647.633688587499
(2022-Mar-09.13368859)
4.6594e-05 TDB
period 1704.500288302376
4.67
1.0661e-05
2.919e-08
d
yr
n .2112055964264739 1.321e-09 deg/d
Q 3.303351411557727 1.3774e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2444  
   data-arc span      35443 days (97.04 yr)  
   first obs. used      1924-01-30  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45699  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:18:29  

Additional Information
 Earth MOID = 1.3136 au 
 Jupiter MOID = 1.83643 au 
 T_jup = 3.290 
[ 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 12.80   n/a E2021B10  
diameter diameter 16.866 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.81893 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 0.057   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B C   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)

2807 Hard (1969 TH6)          Discovered 1969-Oct-15 by Chernykh, L. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1969 TH6 = 1952 BD1 = 1974 XF = 1976 GD3 = A924 BE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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