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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 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .167217170810712 3.7611e-08  
a 3.048649678051404 1.2162e-08 au
q 2.53886310409466 1.1371e-07 au
i 5.565809026779383 4.1519e-06 deg
node 250.117855902041 4.0392e-05 deg
peri 28.50753814709969 4.1941e-05 deg
M 139.9180856437277 1.233e-05 deg
tp 2458244.831943892415
(2018-May-06.33194389)
6.5714e-05 TDB
period 1944.28403552794
5.32
1.1635e-05
3.185e-08
d
yr
n .1851581319507403 1.108e-09 deg/d
Q 3.558436252008147 1.4196e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3313  
   data-arc span      40776 days (111.64 yr)  
   first obs. used      1908-12-16  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44157  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:21:34  

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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1930-Mar-07 20:10 00:02 Jupiter 1.56336908304825 1.56336870471005 1.56336946138681 2.07115072316945 1.79055276456662 2426043.340237408 1.56579468486904 141.907251693533 35.3856225335749 -85.5473954318258 2372420.16523474 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
1978-Jul-24 22:43 < 00:01 Jupiter 1.70516304578136 1.70516251084964 1.70516358071288 2.01285395342315 1.74874276087651 2443714.446183894 0.670492179958931 140.325362202854 25.931283250016 -79.1468898581367 2627017.66536021 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
1987-Dec-04 19:29 < 00:01 Jupiter 1.85958421326844 1.85958377575361 1.85958465078337 2.84731209327066 2.68257443811611 2447134.311577198 0.500873283090399 43.7194566034888 12.1771944903005 -75.3914802628777 3253935.58437262 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2026-Dec-24 12:10 < 00:01 Jupiter 1.99047568850107 1.99047524976032 1.99047612724171 2.37710817931989 2.19079159813043 2461399.006887845 0.374583933221127 67.3247452944582 14.7851717030745 89.5512544335294 3140655.48216031 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2036-May-06 22:19 < 00:01 Jupiter 1.62618260314524 1.62618216451508 1.6261830417753 2.24566283267915 2.00031758320989 2464820.430074995 0.536030770805634 60.615456547799 19.2995444232635 -75.0502821348744 2318991.09358674 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2084-Sep-17 17:21 00:01 Jupiter 1.59215006424939 1.59214967175719 1.59215045674168 2.02337253117708 1.74070044982229 2482486.223230877 1.47494897716094 135.776273570532 41.1565675962743 -83.7405547212394 2293384.86184593 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2133-Feb-11 08:29 00:03 Jupiter 1.77701836599864 1.77701698823148 1.77701974376781 1.94829991111234 1.68599080359317 2500163.853784800 2.58847574100665 186.776669391903 31.7751648696802 -73.9027230528057 1758856.93486411 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2142-Jun-27 11:44 00:03 Jupiter 1.78920737722845 1.78920578735261 1.78920896710683 2.70510136404509 2.52403650187473 2503586.989187283 2.75531664279613 144.075079561094 14.678330582126 -69.1726924090608 2420041.36357354 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22
2190-Nov-21 21:53 00:04 Jupiter 1.59950429855557 1.59950345332845 1.59950514379196 2.18768961817683 1.93051278042904 2521266.412149123 3.56066874160952 240.723664555002 26.0672397313392 -87.8029090107358 1907849.16141192 T 53 CATAB v2.0f-lin.ifort 2020-Aug-24 22:21:58 2020-Aug-24 22:22

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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