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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279373775058942 3.74e-08  
a 3.135922216611792 1.4422e-08 au
q 2.734720552156009 1.1922e-07 au
i 13.10938016714671 4.0328e-06 deg
node 271.2935018310981 1.9904e-05 deg
peri 110.2321713606053 2.6436e-05 deg
M 19.36163016104761 1.6803e-05 deg
tp 2458891.409792180715
(2020-Feb-11.90979218)
9.467e-05 TDB
period 2028.366128692623
5.55
1.3992e-05
3.831e-08
d
yr
n .1774827507260915 1.2243e-09 deg/d
Q 3.537123881067576 1.6267e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      32222 days (88.22 yr)  
   first obs. used      1931-11-16  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39133  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:48:30  

Additional Information
 Earth MOID = 1.77351 au 
 Jupiter MOID = 1.99715 au 
 T_jup = 3.159 
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Orbital Elements at Epoch 2456593.5 (2013-Oct-28.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279605327137845 3.7905e-08  
q 2.735832525846115 1.208e-07 au
tp 2456845.949582331012
(2014-Jul-07.44958233)
9.4772e-05 TDB
node 271.7719257777467 1.9952e-05 deg
peri 107.2964567992623 2.632e-05 deg
i 13.07990976127278 4.033e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      32222 days (88.22 yr)  
   first obs. used      1931-11-16  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39133  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:48:30  

Additional Information
 Jupiter MOID = 1.99715 au 
 T_jup = 3.159 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.436799271493591E-15 -4.554508095546008E-15 -8.71077964536346E-13 6.993532789095537E-15 -1.713024564163391E-13 7.564413725623106E-16
q -4.554508095546008E-15 1.459169789357788E-14 2.676261815357695E-12 -2.184081224571748E-14 5.201923062985958E-13 -1.385639061707926E-15
tp -8.71077964536346E-13 2.676261815357695E-12 8.981640144311829E-9 -1.704051389389821E-12 1.657251364072411E-9 6.470715324423839E-12
node 6.993532789095537E-15 -2.184081224571748E-14 -1.704051389389821E-12 3.980922703400623E-10 -3.880292226613034E-10 1.223780616693747E-11
peri -1.713024564163391E-13 5.201923062985958E-13 1.657251364072411E-9 -3.880292226613034E-10 6.927555635467976E-10 -1.098622988531802E-11
i 7.564413725623106E-16 -1.385639061707926E-15 6.470715324423839E-12 1.223780616693747E-11 -1.098622988531802E-11 1.626513622128709E-11

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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