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464 Megaira (A901 AB)
Classification: Main-belt Asteroid          SPK-ID: 2000464
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 80 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2055896243284616 3.1914e-08  
a 2.800610257299889 1.0512e-08 au
q 2.224833846611169 9.1152e-08 au
i 10.16995839013901 3.8379e-06 deg
node 102.3665943216396 2.1536e-05 deg
peri 258.1893602213157 2.3866e-05 deg
M 253.4250778447555 1.262e-05 deg
tp 2459507.292247578359
6.1481e-05 TDB
period 1711.896245745758
n .2102931184612606 1.184e-09 deg/d
Q 3.376386667988609 1.2674e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2798  
   data-arc span      43573 days (119.30 yr)  
   first obs. used      1901-01-09  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40329  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:06:12  

Additional Information
 Earth MOID = 1.24808 au 
 Jupiter MOID = 2.16459 au 
 T_jup = 3.271 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.7   n/a MPO473767 IRAS observations used: 18
diameter diameter 77.056 km 0.450 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.879 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site,]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pilcher, F. (2019) Minor Planet Bull. 46, 360-363.]
[Polakis, T. (2019) Minor Planet Bull. 46, 287-292.]
geometric albedo albedo 0.045   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.638   0.063 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.10 deg.
Tholen spectral type spec_T FXU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 1 color indices
SMASSII spectral type spec_B C   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)

464 Megaira (A901 AB)          Discovered 1901-Jan-09 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A901 AB = 1929 AH = A912 JB = A912 JC = A916 FD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-May-27 10:41 UT
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