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1863 Antinous (1948 EA)
Classification: Apollo [NEO]          SPK-ID: 2001863
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 75 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .606628317521603 4.9244e-08  
a 2.258866368554856 2.3082e-09 AU
q .8885740638922907 1.1109e-07 AU
i 18.39849797308201 1.155e-05 deg
node 346.5028488987003 2.0535e-05 deg
peri 268.020705390855 2.1741e-05 deg
M 209.3223209299759 3.9057e-06 deg
tp 2457519.515893577914
(2016-May-11.01589358)
1.3763e-05 JED
period 1240.035835707403
3.40
1.9006e-06
5.204e-09
d
yr
n .2903141906335562 4.4498e-10 deg/d
Q 3.629158673217422 3.7084e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      490  
   data-arc span      23978 days (65.65 yr)  
   first obs. used      1948-03-05  
   last obs. used      2013-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61133  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 17:35:13  

Additional Information
 Earth MOID = .182977 AU 
 T_jup = 3.298 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.54 mag n/a PDS3 (MPC 17263)  
diameter diameter 2.1 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 7.4568 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.24   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV .763 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.71, mean=22.67, max.=23.62) deg.
U-B UB .359 mag .042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=21.71, mean=22.67, max.=23.62) deg.
Tholen spectral type spec_T SU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sq   n/a Binzel et al. (2001) Icarus 151, 139-149  

1863 Antinous (1948 EA)          Discovered 1948-Mar-07 by Wirtanen, C. A. at Mount Hamilton (662)
Reference: DISCOVERY.DBLast Updated: 2013-09-05

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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