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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 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .113480039505198 3.0039e-08  
a 2.610154367816905 7.5305e-09 au
q 2.313953947042377 7.9004e-08 au
i 10.23851929099285 3.7458e-06 deg
node 297.5377295350805 1.7442e-05 deg
peri 245.0294233483525 2.3645e-05 deg
M 174.2217077614714 1.6689e-05 deg
tp 2458255.086108797458
(2018-May-16.58610880)
7.0681e-05 TDB
period 1540.273047950569
4.22
6.6657e-06
1.825e-08
d
yr
n .2337247934572398 1.0115e-09 deg/d
Q 2.906354788591432 8.385e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2654  
   data-arc span      41102 days (112.53 yr)  
   first obs. used      1908-01-23  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38827  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:59  

Additional Information
 Earth MOID = 1.33966 au 
 Jupiter MOID = 2.16386 au 
 T_jup = 3.378 
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Orbital Elements at Epoch 2455590.5 (2011-Jan-29.0) TDB
Reference: JPL 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1146367671857919 3.0213e-08  
q 2.310456206149568 7.9622e-08 au
tp 2455170.694535712018
(2009-Dec-05.19453571)
6.7915e-05 TDB
node 297.7440388162431 1.7498e-05 deg
peri 244.6198341992554 2.3463e-05 deg
i 10.22152280944139 3.7408e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2654  
   data-arc span      41102 days (112.53 yr)  
   first obs. used      1908-01-23  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38827  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:59  

Additional Information
 Jupiter MOID = 2.16386 au 
 T_jup = 3.378 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.128180432596508E-16 -2.397191801834903E-15 -4.406943177992269E-13 -3.315614527111277E-16 -1.102724255150623E-13 -1.557863632562169E-16
q -2.397191801834903E-15 6.339641529939449E-15 1.153370221628077E-12 1.895865372362342E-15 2.880930920586177E-13 9.239008643695488E-16
tp -4.406943177992269E-13 1.153370221628077E-12 4.612433529299496E-9 -7.658706795182982E-12 1.071016917372843E-9 1.038799568221298E-12
node -3.315614527111277E-16 1.895865372362342E-15 -7.658706795182982E-12 3.061890188614826E-10 -3.026651231910749E-10 6.045869985481374E-12
peri -1.102724255150623E-13 2.880930920586177E-13 1.071016917372843E-9 -3.026651231910749E-10 5.504957570541303E-10 -5.771114681089452E-12
i -1.557863632562169E-16 9.239008643695488E-16 1.038799568221298E-12 6.045869985481374E-12 -5.771114681089452E-12 1.399355830857725E-11

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

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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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