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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279373792937431 3.7347e-08  
a 3.135922215945842 1.4403e-08 au
q 2.734720545968703 1.1902e-07 au
i 13.10938008570003 4.0295e-06 deg
node 271.2935022689148 1.9873e-05 deg
peri 110.2321702515734 2.6405e-05 deg
M 19.36163106522083 1.6778e-05 deg
tp 2458891.409787121037
(2020-Feb-11.90978712)
9.4532e-05 TDB
period 2028.366128046501
5.55
1.3974e-05
3.826e-08
d
yr
n .1774827507826274 1.2227e-09 deg/d
Q 3.53712388592298 1.6246e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2445  
   data-arc span      32400 days (88.71 yr)  
   first obs. used      1931-11-16  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38947  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:30:16  

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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