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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .235313386039819 1.7463e-08  
a 3.965412416900136 3.3545e-08 au
q 3.032297794035023 6.722e-08 au
i 13.31725401783823 2.7479e-07 deg
node 317.0734475699256 2.1021e-06 deg
peri 1.697221579677229 5.0243e-06 deg
M 195.3647714030993 3.8178e-06 deg
tp 2460519.519573783339
(2024-Jul-28.01957378)
4.2497e-05 TDB
period 2884.237174563871
7.90
3.6598e-05
1.002e-07
d
yr
n .1248163650253333 1.5838e-09 deg/d
Q 4.89852703976525 4.1438e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2398  
   data-arc span      15928 days (43.61 yr)  
   first obs. used      1977-08-14  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43199  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 22:24:37  

Additional Information
 Earth MOID = 2.01725 au 
 Jupiter MOID = .437016 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 11.13   n/a MPCxxxxx  
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. 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:
[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

[ show close-approach data ]
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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