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1213 Algeria (1931 XD)
Classification: Main-belt Asteroid          SPK-ID: 2001213
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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279373839223792 3.6451e-08  
a 3.135922214469684 1.4148e-08 au
q 2.734720530166358 1.1571e-07 au
i 13.10938018718281 4.0107e-06 deg
node 271.2935031123459 1.9349e-05 deg
peri 110.2321685846792 2.601e-05 deg
M 19.36163243481092 1.6605e-05 deg
tp 2458891.409779481313
(2020-Feb-11.90977948)
9.3577e-05 TDB
period 2028.366126614296
5.55
1.3727e-05
3.758e-08
d
yr
n .1774827509079458 1.2011e-09 deg/d
Q 3.537123898773009 1.5958e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2587  
   data-arc span      32486 days (88.94 yr)  
   first obs. used      1931-11-16  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38107  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:21:21  

Additional Information
 Earth MOID = 1.77351 au 
 Jupiter MOID = 1.99715 au 
 T_jup = 3.159 
[ 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 11.1   n/a MPO416717  
diameter diameter 29.175 km 0.251 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 16. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.057   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1213 Algeria (1931 XD)          Discovered 1931-Dec-05 by Reiss, G. at Algiers
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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