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774 Armor (A913 YE)
Classification: Main-belt Asteroid          SPK-ID: 2000774
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 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .167217170181249 3.7729e-08  
a 3.048649678503784 1.2196e-08 au
q 2.538863106390406 1.1413e-07 au
i 5.565809149350072 4.1553e-06 deg
node 250.1178571114301 4.0692e-05 deg
peri 28.50753664425186 4.2239e-05 deg
M 139.9180857386781 1.2339e-05 deg
tp 2458244.831943211411
(2018-May-06.33194321)
6.5777e-05 TDB
period 1944.284035960699
5.32
1.1667e-05
3.194e-08
d
yr
n .1851581319095277 1.1111e-09 deg/d
Q 3.558436250617161 1.4235e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3244  
   data-arc span      40593 days (111.14 yr)  
   first obs. used      1908-12-16  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44511  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:36:48  

Additional Information
 Earth MOID = 1.52418 au 
 Jupiter MOID = 1.57658 au 
 T_jup = 3.209 
[ 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 8.8   n/a MPO319091  
diameter diameter 50.214 km 0.457 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 25.107 h n/a LCDB (Rev. 2019-August); 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:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D.; Higgins, D.; Bennett, M.; Fauerbach, M. (2006) Minor Planet Bull. 33, 95.]
[Oey, J.; Han, X.L.; Gipson, K. (2013) Minor Planet Bull. 40, 64.]
geometric albedo albedo 0.189   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

774 Armor (A913 YE)          Discovered 1913-Dec-19 by Le Morvan, C. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A913 YE = 1955 SW2 = A896 RA = A908 YH = A910 CJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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