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JPL Small-Body Database Browser
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649 Josefa (A907 RO)
Classification: Main-belt Asteroid          SPK-ID: 2000649
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2789832250033331 4.9666e-08  
a 2.545743518113308 9.361e-09 au
q 1.835523781398726 1.2773e-07 au
i 12.71548380370204 4.8384e-06 deg
node 357.0197543678568 1.6286e-05 deg
peri 349.5249525378017 1.7741e-05 deg
M 156.4687167630829 8.413e-06 deg
tp 2457955.669728915508
(2017-Jul-21.16972892)
3.4758e-05 TDB
period 1483.612203082806
4.06
8.1831e-06
2.24e-08
d
yr
n .2426510103192424 1.3384e-09 deg/d
Q 3.255963254827889 1.1973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2234  
   data-arc span      40994 days (112.24 yr)  
   first obs. used      1907-09-12  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43529  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:46:22  

Additional Information
 Earth MOID = .829815 au 
 Jupiter MOID = 2.1732 au 
 T_jup = 3.354 
[ 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 12.7   n/a MPO337247  
diameter diameter 7.726 km 0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.481 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2010) Minor Planet Bull. 37, 45-46.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.345   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Sq   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)

649 Josefa (A907 RO)          Discovered 1907-Sep-11 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A907 RO = 1951 HB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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