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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 223 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .569115637583157 4.3669e-08  
a 2.476487672790801 6.5854e-09 au
q 1.067079811923636 1.0995e-07 au
i 9.384536496398507 5.1975e-06 deg
node 110.4284807992257 2.7241e-05 deg
peri 350.41432328 2.834e-05 deg
M 193.414344736594 1.1784e-05 deg
tp 2459259.200181899189
(2021-Feb-13.70018190)
4.9093e-05 TDB
period 1423.484303668007
3.90
5.6779e-06
1.555e-08
d
yr
n .2529005757719695 1.0088e-09 deg/d
Q 3.885895533657965 1.0333e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1243  
   data-arc span      37095 days (101.56 yr)  
   first obs. used      1918-02-03  
   last obs. used      2019-08-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50197  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Aug-29 05:22:16  

Additional Information
 Earth MOID = .0865708 au 
 Jupiter MOID = 1.31419 au 
 T_jup = 3.220 
[ 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 13.4   n/a MPO265960  
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 73.97 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Dunlap, J.L.; Taylor, R.C. (1979) Astron. J. 84, 269-273.]
[Tungalag, N.; Shevchenko, V.G.; Lupishko, D.F. (2002) Kin. Fiz. Neb. Tel 18, 508-516; Kinematics and Physics of Celestial Bodies 18, ???-???.]
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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