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5661 Hildebrand (1977 PO1)
Classification: Outer Main-belt Asteroid          SPK-ID: 2005661
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2351673268268742 5.3838e-08  
a 3.965902877943145 3.7563e-08 au
q 3.033252099682248 2.1012e-07 au
i 13.31624445401516 5.5696e-06 deg
node 317.0733340428197 1.8947e-05 deg
peri 1.653819225184299 2.0898e-05 deg
M 170.4715571600636 9.9138e-06 deg
tp 2457634.467707669970
(2016-Sep-02.96770767)
7.3847e-05 TDB
period 2884.772295339941
7.90
4.0985e-05
1.122e-07
d
yr
n .1247932117836627 1.773e-09 deg/d
Q 4.898553656204041 4.6397e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2043  
   data-arc span      15783 days (43.21 yr)  
   first obs. used      1977-08-14  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44341  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:41:47  

Additional Information
 Earth MOID = 2.02017 au 
 Jupiter MOID = .436713 au 
 T_jup = 2.963 
[ 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 11.1   n/a MPO492818  
diameter diameter 34.37 km 2.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 6.803 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:
[Warner, B.D.; Stephens, R.D.; Coley, D.R. (2018) Minor Planet Bull. 45, 147-161.]
geometric albedo albedo 0.1364   0.026 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

5661 Hildebrand (1977 PO1)          Discovered 1977-Aug-14 by Chernykh, N. S. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1977 PO1 = 1986 XN3 = 1990 EW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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