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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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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 266 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5703317184308986 4.3543e-08  
a 2.473736929707675 6.0468e-09 au
q 1.062886295641521 1.0944e-07 au
i 9.393855031979152 4.6115e-06 deg
node 110.4342521969208 2.6493e-05 deg
peri 350.4955456805043 2.7378e-05 deg
M 294.5791651788778 9.6421e-06 deg
tp 2459258.751157493319
(2021-Feb-13.25115749)
3.8951e-05 TDB
period 1421.113273039094
3.89
5.2107e-06
1.427e-08
d
yr
n .2533225231442171 9.2884e-10 deg/d
Q 3.884587563773828 9.4955e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1424  
   data-arc span      37472 days (102.59 yr)  
   first obs. used      1918-02-03  
   last obs. used      2020-09-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48159  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-13 07:25:17  

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 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1910-Jan-04 16:47 < 00:01 Earth 0.320542641242942 0.320540664986293 0.320544617500575 6.80478906380226 6.8035674023676 2418676.199630459 0.0728117360240396 102.634888328628 18.0014687171254 -16.5158506319718 752056.771769565 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1914-Jan-02 20:24 < 00:01 Earth 0.211315726738351 0.211315103974698 0.211316349502773 6.10662706679109 6.10456191213749 2420135.350289709 0.0468174728835064 39.6901297731326 18.1822929828411 -44.4773050635231 1349347.19218058 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1918-Jan-03 12:57 < 00:01 Earth 0.216241603151305 0.216240681760034 0.216242524543117 6.51357730621984 6.51168532591522 2421597.039698628 0.0582596112806091 49.6137038250479 19.3661384793933 -24.2313660764674 738017.635162277 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1922-Jan-03 20:13 < 00:01 Earth 0.324854448758212 0.324852816695466 0.324856080822859 8.15241452282135 8.15140836968617 2423058.342132858 0.108010231549414 90.5917886307821 14.4687926600312 -26.4341976677431 1073287.84213693 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1926-Jan-06 17:46 < 00:01 Earth 0.443538766311615 0.443537030696203 0.443540501928186 10.7038707173351 10.7033094738619 2424522.239957548 0.203874641031352 94.4852967530234 28.857195081606 -24.9240410012101 706406.497650425 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1966-Jan-20 07:29 < 00:01 Earth 0.379302026379965 0.379301235672268 0.379302817087684 12.8241048542884 12.8235570702049 2439145.811963886 0.148576391983738 40.0218921079019 20.7375269862013 -11.5856818005384 1068267.59219726 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1970-Jan-11 14:00 < 00:01 Earth 0.22859705178319 0.228596486482453 0.228597617084005 8.84142222564469 8.840103811109 2440598.083438877 0.101307126384923 29.2321557746492 13.5894075754078 -17.4268577115058 991103.365130935 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1974-Jan-04 05:00 < 00:01 Earth 0.13677863594881 0.136778313399441 0.136778958498186 7.09597554031083 7.09322975857644 2442051.708676751 0.0665636052735814 16.6032304610444 14.4008675440011 29.7825947669974 1540788.02390146 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
1977-Dec-15 08:39 < 00:01 Earth 0.337965840469642 0.33796524841311 0.337966432526174 11.6621993793364 11.6615233404526 2443492.860205569 0.139771290626803 29.6093877863398 15.037621557676 5.10340531549613 1384214.25885048 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
2025-Jan-08 13:40 < 00:01 Earth 0.0821976075876292 0.0821968511025332 0.0821983640818317 8.24870181303574 8.24477110249405 2460684.069467850 0.368570400321902 59.1887443594674 12.2098680987526 51.9639052272999 795447.777790984 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
2056-Feb-05 11:25 00:01 Earth 0.281743590121206 0.281732744498185 0.281754435756543 14.6558385767566 14.6551932833903 2472033.975388490 1.12751982425322 548.759561105817 13.8753376685511 -9.77254065843168 427117.851752643 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
2087-Jan-25 21:50 00:02 Earth 0.166324481660599 0.166313354899196 0.166335608435929 11.2689398388518 11.2675181632391 2483346.409679550 1.61816662669154 560.016803941791 12.9043314726008 -7.83607408075397 218955.71446137 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
2122-Jan-30 14:19 < 00:01 Earth 0.258402775600461 0.258400186024169 0.258405365177077 13.022525166402 13.0217333341611 2496134.096820243 0.353671309909036 129.942103701076 13.4644537213069 -6.47714266158537 341692.294337881 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
2125-Dec-01 04:59 < 00:01 Earth 0.364668836887855 0.364664547931837 0.36467312584522 15.3030148486652 15.3025373815337 2497534.707934749 0.391482661927977 216.744063040489 13.1078658361226 9.36810687404563 588256.234949505 T 266 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:33 2020-Sep-13 07:26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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