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887 Alinda (A918 AA)
Classification: Amor [NEO]          SPK-ID: 2000887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 338 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5703317171014647 4.2584e-08  
a 2.473736926874128 5.3036e-09 au
q 1.062886297712706 1.0699e-07 au
i 9.393850626714981 3.2801e-06 deg
node 110.4342436746073 2.4789e-05 deg
peri 350.4955516207881 2.5422e-05 deg
M 294.5791708528576 7.4333e-06 deg
tp 2459258.751134651353
(2021-Feb-13.25113465)
3.0123e-05 TDB
period 1421.113270597369
3.89
4.5702e-06
1.251e-08
d
yr
n .2533225235794702 8.1467e-10 deg/d
Q 3.884587556035551 8.3284e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2027  
   data-arc span      37604 days (102.95 yr)  
   first obs. used      1918-02-03  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4289  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-18 06:07:39  

Additional Information
 Earth MOID = .082217 au 
 Jupiter MOID = 1.31457 au 
 T_jup = 3.221 
[ 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 13.8   n/a MPO492760  
magnitude slope G -0.12   n/a PDS3 (MPC 17260) Fit
diameter diameter 4.2 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 28.41 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.31   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.832   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=5.86, mean=26.59, max.=49.37) deg.
U-B UB 0.436   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=5.86, mean=28.68, max.=49.37) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

887 Alinda (A918 AA)          Discovered 1918-Jan-03 by Wolf, M. at Heidelberg
The Feb. 3 observation given by some authorities is a rediscovery.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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