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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 223 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5703317209528221 4.3627e-08  
a 2.473736933344562 6.8625e-09 au
q 1.062886290965601 1.0973e-07 au
i 9.393853627381491 5.2047e-06 deg
node 110.4342181592923 2.7228e-05 deg
peri 350.49558500 2.8321e-05 deg
M 294.5791565052811 1.2151e-05 deg
tp 2459258.751192302183
(2021-Feb-13.25119230)
4.898e-05 TDB
period 1421.113276173074
3.89
5.9136e-06
1.619e-08
d
yr
n .2533225225855651 1.0541e-09 deg/d
Q 3.884587575723523 1.0776e-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 = .0822169 au 
 Jupiter MOID = 1.31457 au 
 T_jup = 3.221 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456281.5 (2012-Dec-20.0) TDB
Reference: JPL 223 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5676314846940281 4.3647e-08  
q 1.071240788771032 1.0986e-07 au
tp 2456409.196763331940
(2013-Apr-26.69676333)
3.8771e-05 TDB
node 110.5557269857902 2.7356e-05 deg
peri 350.30922211867 2.8462e-05 deg
i 9.359134165325573 5.1825e-06 deg
  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
 Jupiter MOID = 1.31457 au 
 T_jup = 3.221 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.905019793365197E-15 -4.794143443054967E-15 -8.039368030296943E-13 6.417086453787962E-14 -1.161682571704098E-13 -5.004225264484343E-15
q -4.794143443054967E-15 1.206971264883856E-14 2.091702624664741E-12 -1.597235036900276E-13 3.040441215118977E-13 1.389557558869316E-14
tp -8.039368030296943E-13 2.091702624664741E-12 1.503195318339193E-9 -1.049864703443248E-10 3.193345224829396E-10 1.262447369756964E-11
node 6.417086453787962E-14 -1.597235036900276E-13 -1.049864703443248E-10 7.483407609987913E-10 -7.568006503839483E-10 1.725443813588359E-11
peri -1.161682571704098E-13 3.040441215118977E-13 3.193345224829396E-10 -7.568006503839483E-10 8.100885215273138E-10 -1.561130991380954E-11
i -5.004225264484343E-15 1.389557558869316E-14 1.262447369756964E-11 1.725443813588359E-11 -1.561130991380954E-11 2.685802179988587E-11

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 73.97 h n/a LCDB (Rev. 2019-August); 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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