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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1281497843463114 1.8368e-08  
a 3.136811807949891 1.2907e-08 au
q 2.734830051226149 5.6706e-08 au
i 13.10848495648945 3.9034e-07 deg
node 271.2951139353502 1.2238e-06 deg
peri 110.2912140985559 5.0892e-06 deg
M 54.78511001592212 5.0787e-06 deg
tp 2458891.690138650267
(2020-Feb-12.19013865)
2.741e-05 TDB
period 2029.229293390012
5.56
1.2524e-05
3.429e-08
d
yr
n .1774072556377241 1.0949e-09 deg/d
Q 3.538793564673633 1.4561e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2803  
   data-arc span      32632 days (89.34 yr)  
   first obs. used      1931-11-16  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37841  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:17:22  

Additional Information
 Earth MOID = 1.77244 au 
 Jupiter MOID = 1.99628 au 
 T_jup = 3.159 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456881.5 (2014-Aug-12.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1277001919462643 1.8909e-08  
q 2.735768501218692 5.8515e-08 au
tp 2456846.203649309425
(2014-Jul-07.70364931)
2.1509e-05 TDB
node 271.7686545157238 1.2216e-06 deg
peri 107.3549818034286 5.0085e-06 deg
i 13.07983011430558 3.9237e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2803  
   data-arc span      32632 days (89.34 yr)  
   first obs. used      1931-11-16  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37841  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:17:22  

Additional Information
 Jupiter MOID = 1.99628 au 
 T_jup = 3.159 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.575493640010083E-16 -1.085850324490063E-15 -9.117860603985156E-14 -1.785414532708413E-15 -4.630865383116474E-14 -2.469340339444991E-15
q -1.085850324490063E-15 3.424028068044976E-15 3.374417603374246E-13 5.669365267624596E-15 1.564132889145498E-13 7.740808629926633E-15
tp -9.117860603985156E-14 3.374417603374246E-13 4.626269939235714E-10 -9.195300165641997E-12 1.008621144576773E-10 -3.819892136834699E-12
node -1.785414532708413E-15 5.669365267624596E-15 -9.195300165641997E-12 1.492373671260466E-12 -2.662861633247741E-12 8.634368420704754E-14
peri -4.630865383116474E-14 1.564132889145498E-13 1.008621144576773E-10 -2.662861633247741E-12 2.50849245825425E-11 -5.286495922102214E-13
i -2.469340339444991E-15 7.740808629926633E-15 -3.819892136834699E-12 8.634368420704754E-14 -5.286495922102214E-13 1.539518221683487E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.18   n/a E2021B10  
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 16.3722 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2019) 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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