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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2353133857566135 1.7512e-08  
a 3.965412417588924 3.3756e-08 au
q 3.032297795684756 6.7702e-08 au
i 13.31725402192212 2.7533e-07 deg
node 317.073447544056 2.1036e-06 deg
peri 1.697221450542655 5.0713e-06 deg
M 195.3647714355297 3.8205e-06 deg
tp 2460519.519573867182
(2024-Jul-28.01957387)
4.2505e-05 TDB
period 2884.237175315353
7.90
3.6828e-05
1.008e-07
d
yr
n .1248163649928126 1.5938e-09 deg/d
Q 4.898527039493091 4.1699e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2379  
   data-arc span      15919 days (43.58 yr)  
   first obs. used      1977-08-14  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43334  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:48:35  

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 11.12   n/a E2021B10  
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

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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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