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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2055358777228548 3.3096e-08  
a 2.800234946845439 1.1228e-08 au
q 2.22468619921535 9.3878e-08 au
i 10.17000774168045 4.2884e-06 deg
node 102.3661996777843 2.1978e-05 deg
peri 258.2826498871814 2.4562e-05 deg
M 169.1642169827174 1.2585e-05 deg
tp 2457796.240617888984
(2017-Feb-11.74061789)
5.8013e-05 TDB
period 1711.55213983313
4.69
1.0294e-05
2.818e-08
d
yr
n .2103353976906007 1.2651e-09 deg/d
Q 3.375783694475527 1.3536e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2498  
   data-arc span      43220 days (118.33 yr)  
   first obs. used      1901-01-09  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41569  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:07:54  

Additional Information
 Earth MOID = 1.24714 au 
 Jupiter MOID = 2.16195 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 9.52   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
diameter diameter 77.056 km 0.450 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.726 h n/a LCDB (Rev. 2019-January); 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]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.045   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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 ]
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