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6491 (1991 OA)
Classification: Amor [NEO, PHA]          SPK-ID: 2006491
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5904816142029092 4.4103e-08  
a 2.500732941126457 3.8386e-08 au
q 1.024096117359718 1.1644e-07 au
i 5.943587398306937 1.2015e-05 deg
node 301.9311297389127 8.2424e-05 deg
peri 323.5785108769261 8.5829e-05 deg
M 65.45590397212933 1.0545e-05 deg
tp 2457137.869159526203
(2015-Apr-25.36915953)
4.1268e-05 JED
period 1444.439643073667
3.95
3.3258e-05
9.106e-08
d
yr
n .2492315976830606 5.7385e-09 deg/d
Q 3.977369764893197 6.1052e-08 au
  Orbit Determination Parameters
   # obs. used (total)      184  
   data-arc span      8895 days (24.35 yr)  
   first obs. used      1991-03-18  
   last obs. used      2015-07-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53616  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:19:17  

Additional Information
 Earth MOID = .0419398 au 
 Jupiter MOID = 1.17429 au 
 T_jup = 3.194 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 18.9 mag n/a MPO324368  
rotation period rot_per 2.69 h n/a LCDB (Rev. 2015-December); 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:
[Erikson, A.; Mottola, S.; Lagerros, J.S.V.; Lindgren, M.; et al. (2000) Icarus 147, 487-497.]

6491 (1991 OA)          Discovered 1991-Jul-16 by Holt, H. E. at Palomar
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
1906-Jun-20 10:51 00:10 Earth 0.14703545105767 0.147013638799935 0.147057284882236 5.96833519348128 5.96529817382203 2417381.952278089 10.427358695581 1636.97036863947 14.6339502530516 55.3437521100931 583398.260107326 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1943-May-25 22:31 00:05 Mars 0.0897726580216036 0.0897088648695267 0.0898364942815832 10.9358952537458 10.9356036362667 2430870.438306817 4.84192488749331 3869.52036583364 25.9433019643435 43.7977102091285 325669.584063219 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1953-Jun-30 21:48 < 00:01 Jupiter 1.80252698015392 1.80250032757248 1.80255363251663 6.22566951115625 6.14972715828773 2434559.408004689 0.364015133411326 351.733569585442 13.5073738483292 -7.23630430978409 268570.319371214 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1955-May-04 16:17 00:02 Earth 0.374372697510963 0.374301589957042 0.374443804884835 15.8291893766306 15.8287397462155 2435232.178378650 1.52260650775221 3478.14653889456 29.2401259413736 11.7188759311738 318157.066586158 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1959-May-16 13:04 00:02 Earth 0.226479817608412 0.226428706360847 0.226530928214523 11.0687945269114 11.0677316000617 2436705.044254884 2.23200988457374 2327.60386869179 25.3633699492748 16.7336202139262 270985.604525771 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1963-Jun-08 15:07 00:04 Earth 0.117993444450889 0.117976472303577 0.118010415869968 6.81269365253004 6.80937821151245 2438189.129810471 4.09065971349424 534.327493439512 16.9245971889649 4.54999822341688 46102.8367499502 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1965-Jul-07 16:45 < 00:01 Jupiter 1.44203776342211 1.44202781489785 1.4420477119238 4.86773738334109 4.74553574297575 2438949.197570694 0.25257068443043 108.596224704118 10.6016388124466 -10.8493048783896 344801.23909787 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1967-Jul-08 11:25 00:02 Earth 0.112430154266549 0.112410657608181 0.112449652360318 9.22151629193005 9.21894596869464 2439679.975944441 2.03424629539908 909.688169188375 20.3078555020125 34.2518465828585 297066.398336068 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1971-Jul-04 00:31 00:02 Earth 0.0925037048342662 0.0924955033246802 0.0925119076359071 8.42314815635049 8.4197278345031 2441136.521613184 1.66213834759508 476.597819853132 18.9240464325546 48.4738197225093 330032.422978246 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1971-Aug-27 14:18 < 00:01 Mars 0.0804908491566399 0.0804898577086231 0.0804918441007168 12.6681441771084 12.667863406597 2441191.095557225 0.783629686653747 867.918647615747 24.1067246321544 88.2345857116524 464207.235912372 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1975-Jul-05 07:02 00:01 Earth 0.0988225568953194 0.0988160449417395 0.098829069336352 8.58667293062887 8.58353234399052 2442598.792983493 1.06452468697538 345.604570578774 19.312969520078 43.574602736897 322326.324788192 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1977-Jul-03 09:35 < 00:01 Jupiter 1.2681291159432 1.26812571899516 1.26813251288559 4.33616144817309 4.17928635913719 2443327.899584752 0.195291769189044 30.4920627560287 9.44424572095449 -18.1882820308613 621191.88247442 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1979-Jul-20 02:39 < 00:01 Earth 0.154752530023773 0.154743212267101 0.154761847749574 11.884513070123 11.8830642326193 2444074.610087182 0.463494031957368 408.46767283285 22.3070523984182 16.8542632812947 222774.083787916 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1983-Jul-06 17:10 < 00:01 Earth 0.0738695267380228 0.0738674935006266 0.0738715601039535 8.84533372060262 8.84125491543459 2445522.215046328 0.465676898129574 131.197291896472 18.8957462008461 54.0035245515853 295489.647466425 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1987-Jun-22 03:52 < 00:01 Earth 0.0715008617929856 0.0715000366918837 0.0715016868996489 7.63084067534494 7.62595563980338 2446968.660924346 0.258448863401429 26.5271442401236 9.20554423781504 -39.6159473879032 453359.985612068 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1989-Jun-18 22:32 < 00:01 Jupiter 1.18537107356821 1.18536982747808 1.18537231965516 4.10900571968755 3.93125955107553 2447696.438753047 0.295001539449786 9.75479592590464 6.81926913582721 -82.5323242931702 1775099.49765771 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1991-Jul-04 22:56 < 00:01 Earth 0.0574918237973921 0.0574913115111356 0.0574923360850289 8.68696796519225 8.68163128138693 2448442.455883516 0.0709543117201503 20.7000265126032 13.0599451985974 -55.7193036254223 363799.96765375 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1995-May-27 01:43 < 00:01 Earth 0.105487423558395 0.105486566973472 0.105488280142457 9.05437593366728 9.05158583174511 2449864.571596860 0.0736692401339742 28.5386022015268 16.0786138526691 1.92404171990477 348940.679287156 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
1999-May-05 09:37 < 00:01 Earth 0.2442706164153 0.244269237540272 0.244271995289514 14.2808117641479 14.280047928631 2451303.900367860 0.0714033066911917 61.8780605340739 26.5848777168722 10.4115109381845 497921.148928319 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2001-May-23 07:27 < 00:01 Jupiter 1.16190020176752 1.16189929061129 1.16190111292731 4.00952570641766 3.82338869222384 2452052.810628819 0.359430332505002 9.15407422927183 3.18343766250463 76.6493396885369 3565151.64142942 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2003-May-03 18:29 < 00:01 Earth 0.25761676571091 0.257615003812539 0.257618527608279 15.0201233081998 15.0194346960348 2452763.269977619 0.0688384046827212 80.3369614428141 27.0567793591407 11.1387605059178 437742.053506907 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2013-Apr-17 16:47 < 00:01 Jupiter 1.16014604575618 1.16014524553427 1.16014684598647 3.99078226994862 3.80343835490413 2456400.199636878 0.343903518017351 9.36258559496719 3.45932817750297 79.713907422804 3293595.85309552 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2025-Mar-10 19:44 < 00:01 Jupiter 1.16072512072168 1.1607244158758 1.1607258255673 4.00393210397399 3.81732903569415 2460745.322003761 0.281104886206525 10.6254359499483 5.39679501621145 -84.3113306307687 2141282.1711277 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2037-Jan-30 07:56 < 00:01 Jupiter 1.1588239977335 1.15882321303017 1.15882478244594 4.03547388768795 3.85008880651649 2465088.830514335 0.500629209320015 16.3862708226558 7.16218905684988 -57.8308544018768 1429592.74335007 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2048-Dec-20 06:09 00:01 Jupiter 1.15461498384321 1.15461348284548 1.15461648488597 4.09283883463518 3.90949293205394 2469430.756181463 1.1962652257182 32.6911835161694 7.93556101563453 -44.4580159005946 1070019.61577929 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2060-Nov-05 00:47 00:03 Jupiter 1.1567172934362 1.15671346251559 1.15672112454021 4.15309712761157 3.97286893903448 2473768.532587419 2.55459257471753 70.8272807304157 8.33256972199265 -37.7075122414357 887008.350131024 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2072-Sep-15 20:19 00:05 Jupiter 1.16896271585406 1.16895143299043 1.16897399940365 4.25182809206935 4.07784938247922 2478101.346662917 4.76591531629635 167.432385872142 8.70418217004397 -30.5912116961666 724116.505155501 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2082-Aug-22 08:32 00:06 Earth 0.413695527390301 0.413407646947793 0.413983400047341 21.7717251298505 21.7714293002418 2481728.855562592 5.53516900743838 14003.2818260224 16.7665515046128 -4.2638986765919 243950.306442648 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2084-Jul-21 01:34 00:07 Jupiter 1.20820707022468 1.20817255001727 1.20824159226981 4.48538018352258 4.32625942087083 2482427.565107577 7.20458220609829 431.06104771377 9.178792151354 -22.444440111463 558654.601876032 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2086-Aug-01 01:07 00:17 Earth 0.090137301860284 0.0898122247363028 0.0904622731779431 12.8414891278271 12.8391869898729 2483168.546689123 17.2369458977372 13240.9296861876 15.4973187290107 -7.70888886486326 87751.4481917099 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2090-May-06 09:21 00:11 Earth 0.213495596474904 0.21324985853722 0.2137413922982 15.2843606073221 15.2835440479636 2484542.889505146 10.8766371252256 12627.8588639454 31.611314815062 26.1354730561826 359437.807570818 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2096-May-16 12:14 < 00:01 Jupiter 1.30760560775056 1.30758465902956 1.30762655883009 5.00549855827866 4.87437008469405 2486745.009835390 0.357515036175109 404.0437842076 9.94082205124575 -16.4633163734273 462391.658201562 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2108-Feb-25 23:44 00:03 Jupiter 1.56994298786076 1.56992117247442 1.56996480326272 6.17850696740657 6.09055823287272 2491046.488723119 3.24843800497893 113.754818375887 11.0601163942148 -12.9808545615983 529224.692234848 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2121-Aug-14 10:52 00:05 Earth 0.116822901337058 0.116725061724857 0.116920747063885 15.3507756733393 15.3492898230181 2495964.952608269 5.35559193010124 4596.19800519514 19.6477277978625 -21.478241826078 263268.690765199 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2125-Apr-10 22:24 00:03 Earth 0.485872110877825 0.485709268362844 0.486034956630997 25.8826719576928 25.8824600810636 2497300.433653689 2.55517457257572 8296.70782287731 40.2625434702447 15.0378074473365 430128.67212675 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2144-Aug-21 04:33 00:09 Earth 0.169133438426176 0.168895834745497 0.169371056278913 17.3845368312051 17.3836306165655 2504372.689796338 9.44935408299154 11405.9138225498 13.8474729864527 -18.7107581940304 493029.790939326 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2167-Jun-24 01:10 00:25 Earth 0.115994832118759 0.115980903656822 0.116008841275538 11.4219021495456 11.4198908649842 2512714.548617303 25.092970982646 3494.06896005118 13.477305925228 81.5583379632027 911217.854340391 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
2190-May-25 14:21 00:08 Earth 0.108318050630388 0.108311068818981 0.108325100952337 11.7160661239666 11.7139663689574 2521086.097627786 8.26664580596643 3160.48613030563 39.0728443570482 85.4543952174137 299420.119272452 T 26 CATAB v2.0c-linF95 2015-Sep-02 14:19:19 2015-Sep-02 14:19
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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