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JPL Small-Body Database Browser
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861 Aida (A917 BF)
Classification: Main-belt Asteroid          SPK-ID: 2000861
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1024741461135039 3.1899e-08  
a 3.142564644714629 1.3551e-08 au
q 2.820533016141011 1.0399e-07 au
i 8.050993653996397 3.6615e-06 deg
node 114.973894595824 2.7007e-05 deg
peri 192.8393356588458 3.3062e-05 deg
M 303.0345635165019 1.9639e-05 deg
tp 2458922.483551065819
(2020-Mar-13.98355107)
0.00011149 TDB
period 2034.814188025633
5.57
1.3162e-05
3.604e-08
d
yr
n .1769203311626727 1.1444e-09 deg/d
Q 3.464596273288248 1.494e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2872  
   data-arc span      41481 days (113.57 yr)  
   first obs. used      1906-01-24  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42021  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:12:54  

Additional Information
 Earth MOID = 1.80547 au 
 Jupiter MOID = 1.76569 au 
 T_jup = 3.187 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.7   n/a MPO347520  
diameter diameter 66.85 km 3.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 39
rotation period rot_per 10.95 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0571   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 39

861 Aida (A917 BF)          Discovered 1917-Jan-22 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A917 BF = 1939 BL = 1947 OF = 1950 BW1 = A906 BG = A918 GA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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