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657 Gunlod (A908 BK)
Classification: Main-belt Asteroid          SPK-ID: 2000657
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 87 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1134800400006622 3.0159e-08  
a 2.610154368063517 7.641e-09 au
q 2.313953945967766 7.9222e-08 au
i 10.23851879359944 3.8185e-06 deg
node 297.5377301288801 1.7463e-05 deg
peri 245.0294222593643 2.387e-05 deg
M 174.2217081034769 1.6828e-05 deg
tp 2458255.086107228533
(2018-May-16.58610723)
7.1359e-05 TDB
period 1540.273048168862
4.22
6.7635e-06
1.852e-08
d
yr
n .2337247934241156 1.0263e-09 deg/d
Q 2.906354790159268 8.5081e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2539  
   data-arc span      41043 days (112.37 yr)  
   first obs. used      1908-01-23  
   last obs. used      2020-06-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39599  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:18:18  

Additional Information
 Earth MOID = 1.33966 au 
 Jupiter MOID = 2.16386 au 
 T_jup = 3.378 
[ 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 11.2   n/a MPO492757 IRAS observations used: 8
diameter diameter 39.401 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.6652 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (1980) Minor Planet Bull. 7, 26-27.]
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hamanowa, H.; Hamanowa, H. (2009) Minor Planet Bull. 36, 87-88.]
geometric albedo albedo 0.044   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

657 Gunlod (A908 BK)          Discovered 1908-Jan-23 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A908 BK = 1927 SC = 1929 AM = 1936 YJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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