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265 Anna (A887 DA)
Classification: Main-belt Asteroid          SPK-ID: 2000265
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2673355083401692 9.7452e-09  
a 2.419367933583632 6.4811e-09 au
q 1.772584977197148 2.2936e-08 au
i 25.64975706371085 7.3717e-07 deg
node 335.5277645765571 1.8613e-06 deg
peri 251.5732680408292 4.1365e-06 deg
M 195.1906703367616 3.7299e-06 deg
tp 2460025.760685925419
(2023-Mar-22.26068593)
1.5865e-05 TDB
period 1374.520771342476
3.76
5.5232e-06
1.512e-08
d
yr
n .2619094651064406 1.0524e-09 deg/d
Q 3.066150889970118 8.2137e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2934  
   data-arc span      44543 days (121.95 yr)  
   first obs. used      1899-08-14  
   last obs. used      2021-07-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36177  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:25:09  

Additional Information
 Earth MOID = .912938 au 
 Jupiter MOID = 2.32724 au 
 T_jup = 3.335 
[ 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 11.94   n/a E2021B10  
diameter diameter 22.767 km 0.379 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 11.681 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Bembrick, C.S.; Bolt, G. (2005) Minor Planet Bull. 32, 18-19.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.113   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

265 Anna (A887 DA)          Discovered 1887-Feb-25 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A887 DA = 1933 QN = 1933 RC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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