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

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 198 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6065072166601064 2.6684e-08  
a 2.258411530649289 1.595e-09 au
q .8886686391220981 6.0226e-08 au
i 18.40043382088493 5.4827e-06 deg
node 346.4403101410485 1.1406e-05 deg
peri 268.0670168922298 1.1701e-05 deg
M 69.81354958291149 3.3266e-06 deg
tp 2458760.096785979125
(2019-Oct-03.59678598)		 1.1355e-05 TDB
period 1239.661320253209
3.39		 1.3133e-06
3.596e-09		 d
yr
n .2904018977751663 3.0764e-10 deg/d
Q 3.62815442217648 2.5624e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1044  
   data-arc span      26615 days (72.87 yr)  
   first obs. used      1948-03-05  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48798  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-16 06:03:16  

Additional Information
 Earth MOID = .182709 au 
 Jupiter MOID = 2.02021 au 
 T_jup = 3.298 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457296.5 (2015-Oct-01.0) TDB
Reference: JPL 198 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6063244974230366 2.6684e-08  
q .8895761106145043 6.0262e-08 au
tp 2457519.561070485956
(2016-May-11.06107049)		 1.0906e-05 TDB
node 346.4900147326235 1.1402e-05 deg
peri 267.9985649155753 1.1699e-05 deg
i 18.40009007536107 5.4823e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1044  
   data-arc span      26615 days (72.87 yr)  
   first obs. used      1948-03-05  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48798  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-16 06:03:16  

Additional Information
 Jupiter MOID = 2.02021 au 
 T_jup = 3.298 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.120220262046931E-16 -1.607920143477937E-15 -1.219580884459376E-13 1.611467126867093E-15 -3.493696772585471E-14 -4.23111826040225E-15
q -1.607920143477937E-15 3.631479070449347E-15 2.779963319582657E-13 -3.706145119269276E-15 7.916377615034447E-14 1.057361109773177E-14
tp -1.219580884459376E-13 2.779963319582657E-13 1.189321713893827E-10 4.748638049661011E-12 3.447281275715718E-11 3.235355791110226E-12
node 1.611467126867093E-15 -3.706145119269276E-15 4.748638049661011E-12 1.300111398642492E-10 -1.208849540946023E-10 3.200616746225331E-12
peri -3.493696772585471E-14 7.916377615034447E-14 3.447281275715718E-11 -1.208849540946023E-10 1.368651237430052E-10 -1.746176261055344E-12
i -4.23111826040225E-15 1.057361109773177E-14 3.235355791110226E-12 3.200616746225331E-12 -1.746176261055344E-12 3.00561099971166E-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 15.40   n/a E2021B10  
diameter diameter 2.1 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 7.453 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D. (2016) Minor Planet Bull. 43, 240-250.]
[Warner, B.D. (2017) Minor Planet Bull. 44, 22-36.]
[Warner, B.D.; Pravec, P.; Kusnirak, P.; Benishek, V.; Ferrero, A. (2017) Minor Planet Bull. 44, 206-212.]
geometric albedo albedo 0.24   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.763   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=21.71, mean=22.67, max.=23.62) deg.
U-B UB 0.359   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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