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961 Gunnie (A921 TH)
Classification: Main-belt Asteroid          SPK-ID: 2000961
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09105945328783836 3.763e-08  
a 2.693760329057226 1.0032e-08 au
q 2.448467986204807 9.9985e-08 au
i 10.99143023578411 4.0406e-06 deg
node 26.61593328611816 2.07e-05 deg
peri 285.2752879916765 3.191e-05 deg
M 181.9071743078274 2.6314e-05 deg
tp 2459799.378585844587
(2022-Aug-07.87858584)
0.00011925 TDB
period 1614.867357998755
4.42
9.021e-06
2.47e-08
d
yr
n .2229285261212628 1.2453e-09 deg/d
Q 2.939052671909644 1.0946e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3083  
   data-arc span      36028 days (98.64 yr)  
   first obs. used      1921-10-11  
   last obs. used      2020-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37946  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:36  

Additional Information
 Earth MOID = 1.46346 au 
 Jupiter MOID = 2.3184 au 
 T_jup = 3.338 
[ 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 11.5   n/a MPO365254  
diameter diameter 36.571 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 21.361 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.036   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

961 Gunnie (A921 TH)          Discovered 1921-Oct-10 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A921 TH = 1930 XT = 1968 HO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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