Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 
[ 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

[ hide close-approach data ]
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 0.320542466422341 0.320540469632409 0.320544463213294 6.80478995941053 6.80356829747034 2418676.199615640 0.0733173836325954 103.69119021746 18.3964652409343 -16.5023562453486 718350.738240871 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1914-Jan-02 20:24 < 00:01 Earth 0.21131565630814 0.211315028903678 0.211316283713394 6.10662726514314 6.10456210986821 2420135.350283473 0.0483430505786336 40.1762187046529 18.4264653940851 -44.9143965542751 1280540.43603322 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1918-Jan-03 12:57 < 00:01 Earth 0.216241616294962 0.216240693307359 0.216242539283107 6.51357757822807 6.5116855981175 2421597.039696162 0.0597449812483371 49.7328838640988 20.0401389869114 -24.4889697776527 708382.842640064 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1922-Jan-03 20:13 < 00:01 Earth 0.324854489360805 0.32485285588725 0.324856122836262 8.15241427104751 8.15140811800701 2423058.342129550 0.108964690037967 90.6683042527642 15.000470686952 -26.4590788387031 1030972.92922711 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1926-Jan-06 17:46 < 00:01 Earth 0.443538788679899 0.443537051449076 0.443540525911908 10.7038689861261 10.7033077425904 2424522.239950333 0.204419315217192 94.6229256507687 28.9887036679585 -25.0052951660131 705746.5970684 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1966-Jan-20 07:29 < 00:01 Earth 0.379302005586081 0.379301205738363 0.37930280543382 12.8241025816238 12.8235547974132 2439145.811958487 0.148804111580031 40.5344949186565 20.9064027894416 -12.0325537675879 1055445.34927121 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1970-Jan-11 14:00 < 00:01 Earth 0.228597047176245 0.228596480626682 0.228597613725886 8.84142070353423 8.84010228874496 2440598.083432293 0.101523020010321 29.3671517292036 14.2061371668159 -18.2048812773824 979910.995552656 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1974-Jan-04 05:00 < 00:01 Earth 0.136778610716827 0.1367782878199 0.136778933613763 7.0959753479145 7.09322956559901 2442051.708670878 0.0671732897273291 16.7303983337908 14.7529651766006 35.0435776294405 1531051.31721098 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
1977-Dec-15 08:39 < 00:01 Earth 0.337965765577096 0.337965168182191 0.337966362972 11.6622002232667 11.6615241842821 2443492.860200570 0.142295271237214 29.8610064455478 15.2104813812025 4.64228666280642 1368782.3978513 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
2025-Jan-08 13:40 < 00:01 Earth 0.0821977284617761 0.0821968785431987 0.0821985783945296 8.24870668947713 8.24477598704189 2460684.069529760 0.46262466967207 70.7620885072012 13.2147325042325 54.6104042354758 771869.259389544 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
2056-Feb-05 11:25 00:01 Earth 0.281746607646603 0.281733319622569 0.281759895688367 14.655925104497 14.6552798218518 2472033.975615683 1.40381452949538 671.932246256068 14.8943939807881 -9.56857195904959 387757.258848459 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
2087-Jan-25 21:50 00:02 Earth 0.166327615447388 0.166314050705986 0.166341180208655 11.2690267487515 11.2676051108919 2483346.410001679 1.9940102193986 682.468915903469 13.7847243732822 -7.68000553261062 199719.421570693 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
2122-Jan-30 14:19 < 00:01 Earth 0.258402276574545 0.258399163723085 0.258405389426681 13.0225101352228 13.0217183005386 2496134.096783535 0.394435337943272 156.618181646385 14.858219823594 -7.71391585362692 332960.003172669 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
2125-Dec-01 04:59 < 00:01 Earth 0.364669692757048 0.364664607307732 0.364674778208126 15.3030439043798 15.3025664392754 2497534.707861061 0.492030018336204 256.757295721858 13.3426831551573 9.03551936731011 544550.557697858 T 223 CATAB v2.0f-lin.ifort 2019-Aug-29 05:22:27 2019-Aug-29 05:22
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Mar-29 16:37 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin