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4257 Ubasti (1987 QA)
Classification: Apollo [NEO]          SPK-ID: 2004257
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 181 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4683921811806701 4.9146e-08  
a 1.647086656933804 6.3042e-09 au
q .8756041450990016 8.0438e-08 au
i 40.71242443599848 5.0049e-06 deg
node 169.1866858382338 1.0037e-05 deg
peri 278.9331551219168 1.1317e-05 deg
M 134.9599037763625 1.8031e-05 deg
tp 2458711.048796589648
(2019-Aug-15.54879659)
3.7174e-05 TDB
period 772.099196220509
2.11
4.4328e-06
1.214e-08
d
yr
n .4662613324327113 2.6769e-09 deg/d
Q 2.418569168768607 9.257e-09 au
  Orbit Determination Parameters
   # obs. used (total)      821  
   data-arc span      12069 days (33.04 yr)  
   first obs. used      1987-08-23  
   last obs. used      2020-09-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48452  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-13 07:25:19  

Additional Information
 Earth MOID = .169603 au 
 Jupiter MOID = 3.36504 au 
 T_jup = 3.913 
[ 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 15.9   n/a MPO452225  
rotation period rot_per 4.4 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.]

4257 Ubasti (1987 QA)          Discovered 1987-Aug-23 by Mueller, J. 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
1911-Jul-24 17:44 < 00:01 Mars 0.0394457921681656 0.0394394273286656 0.0394521577758662 22.6262748532732 22.6259540819581 2419242.238839833 0.495928149412331 419.934999855414 18.1198943790329 -40.9466156322066 213227.833770725 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1913-Sep-23 00:32 < 00:01 Earth 0.288504432429725 0.288503860501164 0.288505004565806 22.9994517848948 22.9990502288444 2420033.522377000 0.199121907996814 472.041042962116 16.3712482840868 87.1621408050485 2690436.70589742 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1914-Feb-26 17:33 < 00:01 Earth 0.488850357193959 0.488841798070139 0.488858967692208 19.9965548297427 19.9962822558845 2420190.230957913 0.0692192542565128 7924.53304397693 21.9278195676397 -86.9073797545561 3395533.15049193 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1916-Mar-10 04:56 < 00:01 Earth 0.279227284120339 0.279219658985299 0.27923490936331 27.2562493732299 27.2558992739643 2420932.705623767 0.43270738702408 468.638428655815 14.4686083471744 35.7905572841045 1660379.59945884 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1932-Sep-24 10:19 < 00:01 Earth 0.318168362696504 0.318165306729267 0.318171418846931 21.2811417825165 21.2807482646509 2426974.930126152 0.0730775625460296 411.797083425452 14.9605490368101 -68.3750446567731 3075922.46296005 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1933-Feb-26 19:25 < 00:01 Earth 0.351442948267079 0.35143600662722 0.351449889996316 20.5694540383858 20.5690854525435 2427130.308957168 0.098764672430551 445.035098586931 13.753586329751 -38.9611515729713 2591379.18662215 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1935-Mar-16 07:04 < 00:01 Earth 0.412311847952101 0.412304705566192 0.412318990358798 30.3603778045094 30.3601649509617 2427877.794450594 0.394447060481695 384.972981942513 15.0414140877474 22.325759528768 1522406.66852565 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1949-Sep-14 03:48 < 00:01 Earth 0.473302883093356 0.473298149131434 0.473307617082828 29.505749971392 29.5055591759686 2433173.658677851 0.260767303994065 297.21866217816 17.4540035092403 37.4922882022541 2433276.29159246 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1951-Sep-25 10:40 < 00:01 Earth 0.395661322320187 0.395657703502618 0.395664941218138 20.2038204660774 20.2034871480213 2433914.944634859 0.0470023953777017 334.750623633775 12.9417578895419 -57.445703167826 4075356.12090747 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1952-Feb-29 10:42 < 00:01 Earth 0.232647586325892 0.232643527926734 0.232651644807387 21.7075428153172 21.707015210907 2434071.945965273 0.150793873711689 297.796195380596 8.68665952741906 -47.2146679293558 3077279.7343018 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1968-Sep-17 22:52 < 00:01 Earth 0.374782830840146 0.374780342237194 0.374785319465275 26.7289347478266 26.7286687652556 2440117.452863974 0.137353351144866 191.007742265506 17.3175142598792 49.7596779366202 2463815.55121002 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1970-Sep-24 07:48 < 00:01 Earth 0.49107945158106 0.49107692062982 0.491081982567695 19.6268431715228 19.6265667236829 2440853.824948628 0.0694023573786902 243.945478941989 11.8087938670171 -58.9555587376813 5728990.075305 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1971-Mar-04 05:21 < 00:01 Earth 0.170629150880343 0.170628838010754 0.170629463779602 23.3987268405113 23.3980594606562 2441014.722788635 0.129861431638825 185.050029996419 12.3816231566862 -87.0523498744457 2074468.65030731 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
1987-Sep-21 20:12 < 00:01 Earth 0.30795590369977 0.307955099291246 0.307956708116696 24.374735919212 24.3743809529595 2447060.341963436 0.0573268667788241 97.232571722453 17.0040828398507 67.6980842999957 2536428.05821716 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:25
1990-Mar-07 19:48 < 00:01 Earth 0.212403636639166 0.212402368678502 0.212404904608246 25.5853935256536 25.5849032250039 2447958.324668700 0.0777248711426775 93.1154201842086 14.0573317659498 47.9555409383566 1676365.38525479 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:25
2006-Sep-23 22:33 < 00:01 Earth 0.292212837257547 0.292212492056105 0.292213182459021 22.3702089940014 22.3698013819828 2454002.439688060 0.0383348317660986 31.047536361948 16.8901314081456 -82.6717017533552 2642363.63632891 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:25
2007-Feb-26 20:52 < 00:01 Earth 0.441512067370453 0.441511417955196 0.441512716805763 20.1432971640391 20.1429975635979 2454158.369685349 0.0466996579621314 169.882350431893 14.7687788664688 -80.1950445649176 4691147.63260235 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:25
2009-Mar-12 06:47 < 00:01 Earth 0.324292526960099 0.324291860585074 0.324293193335492 28.3108860635918 28.310595845702 2454902.782836797 0.0504555970592878 38.6997599420397 16.5008170754864 34.5179362391204 1932182.2269128 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:25
2025-Sep-24 20:03 < 00:01 Earth 0.339311001978201 0.339309871933212 0.339312132033818 20.8973742317009 20.8969984578117 2460943.335228321 0.0411962505334785 113.104596621791 14.6923433609652 -60.9807750352765 3165654.10230821 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2026-Feb-27 11:14 < 00:01 Earth 0.311107890113613 0.311106083148676 0.311109697085182 20.8731993810509 20.8727890668215 2461098.967861133 0.0543631594857861 115.25357239671 7.84778252415155 -38.6796108082873 4190849.04230274 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2028-Mar-17 07:12 < 00:01 Earth 0.457105814135186 0.457103735243528 0.457107893028819 31.396775468054 31.3965898108318 2461847.799746702 0.138257834090578 114.100965291394 15.3202103916241 24.9363212902555 1907204.71726641 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2042-Sep-15 16:01 < 00:01 Earth 0.444189811340861 0.444187128585421 0.444192494110036 28.6630928383707 28.6628835609861 2467143.167485563 0.173339106744723 182.56284957809 17.655992635439 43.1314724677296 2553141.68641279 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2044-Sep-24 11:01 < 00:01 Earth 0.423954384336254 0.423951749353907 0.423957019352436 19.9971983619155 19.9968840741436 2467882.958912318 0.044562769107031 230.81588618786 12.7255729202909 -55.4266685016154 4359481.65859957 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2045-Mar-01 12:43 < 00:01 Earth 0.203680261595711 0.203677982107943 0.203682541133611 22.1934706914762 22.1928812455697 2468041.030045005 0.123407144774507 196.26204132644 10.1660105834674 -54.715628419907 2519896.58860546 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2061-Sep-19 04:33 < 00:01 Earth 0.353513139521632 0.353510146622536 0.353516132480491 25.9947962143649 25.9945062645731 2474086.689759516 0.208160010879167 274.841684919884 17.5261321131574 57.2918639914394 2540343.98396691 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2064-Mar-04 13:35 < 00:01 Earth 0.172707988574282 0.172707078632279 0.172708898688334 24.0135441848538 24.0129017198478 2474984.065963249 0.229870246973756 287.230418081191 12.9476634530868 81.2820379462228 1979613.37972242 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2080-Sep-21 21:39 < 00:01 Earth 0.299376617436841 0.299375071789418 0.299378163272326 23.7061098617267 23.7057344242469 2481029.402297288 0.212447025049384 391.348221908266 17.0509901222985 78.915467078202 2620461.67724412 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2083-Mar-09 09:52 < 00:01 Earth 0.242829552469141 0.242823792959525 0.242835312112787 26.3613182650076 26.3609020218364 2481927.910930354 0.376718974498102 404.500819201619 14.1922081897738 44.7982748445267 1781741.06296105 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2099-Sep-24 16:08 < 00:01 Earth 0.302970801570128 0.302968246157007 0.302973357304179 21.8424603013493 21.8420576640275 2487971.172060534 0.149891746696578 511.743947360985 15.9689998031855 -75.6889388600369 2845532.78252686 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2100-Feb-27 05:37 < 00:01 Earth 0.396882503006426 0.396873610359897 0.396891396198911 20.3412893669609 20.3409593202196 2488126.733840659 0.0736554641644568 858.21219190001 19.7293629613983 -58.9126242522872 2746511.6841034 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2102-Mar-15 03:48 < 00:01 Earth 0.366278043342149 0.366269034285246 0.366287052459972 29.2796652831988 29.2794168342256 2488872.658611180 0.528558086905446 507.328294208918 14.8363674173325 27.6984563114627 1677958.16711901 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2118-Sep-26 03:41 < 00:01 Earth 0.365835395277658 0.365828796882395 0.36584199400367 20.5338882887407 20.5335335903723 2494911.653386322 0.0413411303581243 640.079779379925 14.1072355625367 -59.0879042951851 3497226.50743893 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2119-Mar-01 09:40 < 00:01 Earth 0.268834698335144 0.268825472499084 0.268843924390752 21.2795314587826 21.2790656906982 2495067.902950747 0.252659292140765 598.711264657793 7.15406866948726 -39.7909494263082 3943311.61969183 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2133-Jul-05 05:23 < 00:01 Mars 0.0642075997727221 0.0641971127332797 0.0642180869661597 21.5923586314102 21.5921521306079 2500307.723981162 0.62295503707252 545.978083812603 17.7568191784576 16.7089807305672 156390.543850895 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2135-Sep-18 12:11 < 00:01 Earth 0.408204187118795 0.408195732777133 0.408212641663188 27.562418207775 27.5621813871902 2501113.007305946 0.512143902823393 619.589180253189 17.7331641338922 47.1481996645908 2503583.72780436 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2137-Sep-25 08:15 < 00:01 Earth 0.461294700637851 0.461286008723292 0.461303392926042 19.7708626489296 19.7705704951689 2501850.843787434 0.140655765520545 785.353757780118 12.2734823057149 -56.5127008148364 5011585.42763264 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2138-Mar-04 00:43 < 00:01 Earth 0.178426524638563 0.178422500771137 0.178430549309305 22.8859545427059 22.8853020283056 2502010.530149219 0.424940248516437 630.767800791508 11.4964669749918 -71.4774171939349 2235088.99362391 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2150-Jun-05 15:12 < 00:01 Mars 0.0270098147684335 0.0270009811095313 0.0270186505102599 22.454216234243 22.4537441807176 2506487.133109413 0.69365503978799 578.129524314296 18.6226059742648 -40.3820359640724 140364.029541955 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2154-Sep-21 20:27 < 00:01 Earth 0.3255173434455 0.325511833620864 0.325522853718254 24.9328368094757 24.9325085106049 2508056.352108747 0.426294258057947 663.103739586164 17.5030669619501 65.56522039547 2551057.69195872 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2157-Mar-07 15:32 < 00:01 Earth 0.195799637630294 0.195792964445178 0.19580631151321 25.0749891665717 25.0744464608269 2508954.147241735 0.568671486166641 671.612421441371 13.6185311073753 60.3184803359042 1858287.62062684 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2173-Sep-24 04:12 < 00:01 Earth 0.294152396690286 0.29415205819705 0.294152735183622 22.8342536663959 22.8338569712223 2514998.674850789 0.286068070288904 675.866006369597 16.8780510196806 -89.9817737262584 2672477.15372308 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2174-Feb-27 15:36 < 00:01 Earth 0.470776694787346 0.470764616625152 0.47078887886389 20.1012437948928 20.1009622306428 2515155.149751221 0.0643282939988065 11158.0396146333 20.7886758117947 -86.8940286652753 3449954.40003597 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2176-Mar-11 20:14 < 00:01 Earth 0.297032973189539 0.297021897044757 0.297044049534469 27.6683011371204 27.6679769261209 2515898.343286969 0.65536103863785 673.050872365036 14.5777077052683 34.8616726131988 1709841.63245147 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2192-Sep-25 08:45 < 00:01 Earth 0.32398562514364 0.323980491331579 0.32399075943755 21.2611106675283 21.2607238513607 2521939.864698911 0.122029335288402 674.678091371581 15.6147992063204 -67.7368212027233 2991637.9970239 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2193-Feb-27 21:17 < 00:01 Earth 0.341650551368017 0.341639314053964 0.341661788969533 20.6856283496777 20.6852513287385 2522095.386647919 0.169208363980067 747.230681829386 12.9659820739908 -41.423511972986 2829082.22272138 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
2195-Mar-17 14:42 < 00:01 Earth 0.423259711502792 0.423248029169129 0.423271393898768 30.6019794904851 30.6017737795563 2522843.112301649 0.687864496472742 636.385833447796 15.1470917831689 23.7440599731543 1639678.87988739 T 181 CATAB v2.0f-lin.ifort 2020-Sep-13 07:25:32 2020-Sep-13 07:26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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