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4768 Hartley (1988 PH1)
Classification: Main-belt Asteroid          SPK-ID: 2004768
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2378706334634875 5.3142e-08  
a 3.172824830677765 2.0792e-08 au
q 2.418102978335763 1.6598e-07 au
i 20.09143565512425 5.8097e-06 deg
node 320.4840955369514 1.1286e-05 deg
peri 26.45754908241819 1.4455e-05 deg
M 203.4486050270913 1.2576e-05 deg
tp 2459898.180955111253
(2022-Nov-14.68095511)
7.8084e-05 TDB
period 2064.275082927079
5.65
2.0291e-05
5.555e-08
d
yr
n .1743953618281974 1.7143e-09 deg/d
Q 3.927546683019767 2.5738e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2001  
   data-arc span      14200 days (38.88 yr)  
   first obs. used      1981-07-25  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41117  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:13:15  

Additional Information
 Earth MOID = 1.4239 au 
 Jupiter MOID = 1.54134 au 
 T_jup = 3.065 
[ 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 11.4   n/a MPO502199  
diameter diameter 34.349 km 0.485 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 22.08 h n/a LCDB (Rev. 2019-August); 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. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.039   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4768 Hartley (1988 PH1)          Discovered 1988-Aug-11 by Noymer, A. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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