+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1620 Geographos (1951 RA) Classification: Apollo [NEO, PHA]          SPK-ID: 2001620 [ 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 610 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3354548016359858 1.1315e-08   a 1.245666863802655 1.5848e-10 au q .8278019331012146 1.4161e-08 au i 13.33704335138623 2.5701e-06 deg node 337.1869752871972 2.6317e-06 deg peri 276.956067654262 3.488e-06 deg M 235.112641401838 3.0584e-06 deg tp 2459176.664045134509 (2020-Nov-23.16404513) 4.345e-06 TDB period 507.810053477714 1.39 9.6911e-08 2.653e-10 d yr n .7089264923657113 1.3529e-10 deg/d Q 1.663531794504095 2.1165e-10 au   Orbit Determination Parameters    # obs. used (total)      4805      # delay obs. used      3      # Doppler obs. used      4      data-arc span      25067 days (68.63 yr)      first obs. used      1951-08-31      last obs. used      2020-04-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40678      source      ORB      producer      Otto Matic      solution date      2020-Oct-02 06:44:01   Additional Information  Earth MOID = .0303535 au   Jupiter MOID = 3.45747 au   T_jup = 5.074  [ 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 15.3   n/a MPO502169 IRAS observations used: 2 diameter diameter 2.56 km 0.15 Hudson & Ostro, Icarus 193 (2008) 20-38   extent extent 5.0x2.0x2.1 km 0.15 Hudson & Ostro, Icarus 193 (2008) 20-38   rotation period rot_per 5.22204 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Dunlap, J.L. (1974) Astron. J. 79, 324-332.] [Michalowski, T.; Kwiatkowski, T.; Borczyk, W.; Pych, W. (1994) Acta Astronomica 44, 223-226.] [Kwiatkowski, T. (1995) Astron. Astrophys. 294, 274-277.] [Magnusson, P.; Dahlgren, M.; Barucci, M.A.; Jorda, L.; et al. (1996) Icarus 123, 227-244.] [Hudson, R.S.; Ostro, S.J. (1999) Icarus 140, 369-378.] [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Vokrouhlicky, D.; Kaasalainen, M.; Higgins, D.; et al. (2008). Astron. Astrophys. 489, L25-28.] [Higgins, D.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Brinsfield, J.W.; Allen, B.; Warner, B.D. (2008) Minor Planet Bull. 35, 123-126.] [Polishook, D. (2009) Minor Planet Bull. 36, 119-120.] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2016) Minor Planet Bull. 43, 143-154.] [Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.] [Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 304-314.] [Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 23-34.] [Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 105-120.] geometric albedo albedo 0.290   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   B-V BV 0.862   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=17.27, mean=33.74, max.=52.91) deg. U-B UB 0.471   0.053 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=36.47, mean=37.14, max.=37.75) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 1620 Geographos (1951 RA)          Discovered 1951-Sep-14 by Wilson, A. G. and Minkowski, R. at Palomar Reference: DISCOVERY.DB Last 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 1901-Aug-23 17:36 < 00:01 Earth 0.033898798065041 0.0338987225406443 0.033898873594018 11.7628682869653 11.7561842594333 2415620.233646297 0.0335250102843651 20.6536312968006 0.946799604979519 -79.8189749883929 4955463.94646347 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1908-Feb-27 21:01 < 00:01 Earth 0.348816283025744 0.348816017349485 0.348816548702082 8.11646734509303 8.11552616281264 2417999.375890912 0.0573742924367891 16.0428039907812 3.47421862183847 -35.2934864395965 9021392.31434532 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1908-Jun-07 22:49 < 00:01 Earth 0.281640225991262 0.281640129636175 0.281640322346365 8.58385910488179 8.5827568983619 2418100.450389905 0.135979687473288 5.66359156503981 2.21452235088253 35.1177477329668 8838016.64354605 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1908-Aug-31 15:22 < 00:01 Earth 0.362319986200093 0.362319704295542 0.362320268104665 7.08126476174418 7.08022617904831 2418185.140148312 0.169472938646691 15.1932639873725 9.0255643925321 28.1771474002492 2618477.20949698 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1915-Mar-14 16:15 < 00:01 Earth 0.0815993928679713 0.0815993156531846 0.0815994700829992 12.1053030103423 12.1026052823424 2420571.177272291 0.0157038049295311 11.3056316364174 2.88222898566954 76.4991801303115 3818338.41203549 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1919-Sep-08 06:12 < 00:01 Earth 0.311151526514238 0.311151365884678 0.311151687143798 20.0282336080591 20.0278060428021 2422209.758465208 0.0111360430254632 8.02965431963585 1.46930100158637 4.0976006907878 5636621.04536784 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1922-Feb-27 21:16 < 00:01 Earth 0.391750640491455 0.391750465360585 0.391750815622326 22.2397508238162 22.2394449968964 2423113.385876041 0.0116590047223116 8.73367249585026 3.6423497347191 0.800333038312568 6193260.36026653 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1926-Aug-21 06:24 < 00:01 Earth 0.0664835778438618 0.0664834734671675 0.0664836822206052 10.5595867580345 10.5557907325507 2424748.766765431 0.0109414704174486 5.96223368853452 0.966260245321886 -29.6173500188001 5316428.2759583 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1933-Mar-11 02:46 < 00:01 Earth 0.273686067829649 0.273685942748264 0.273686192911143 7.6540850389639 7.65281299396946 2427142.615484701 0.02552876729921 10.5802128020893 1.41638354951326 -54.593498394786 10183866.8784725 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1933-May-08 19:40 < 00:01 Earth 0.270760876904921 0.270760782584008 0.27076097122585 7.79123992975419 7.78997677932925 2427201.319572333 0.064883803523403 5.14478009750114 2.74047360911862 28.6235168204282 6027248.63394681 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1933-Sep-19 01:30 < 00:01 Earth 0.43345319879531 0.433453145334812 0.433453252255858 7.909783981687 7.90900679230578 2427334.562811104 0.0189715891993644 8.02969251674322 1.77869952010007 -75.3186471168214 16595408.3371424 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1940-Mar-09 21:19 < 00:01 Earth 0.147028992282013 0.147028826599245 0.147029157964798 14.9940357159366 14.9928270442752 2429698.388280539 0.00952673464328311 8.69045124837149 2.77956149962375 19.1136498382917 3214763.73061299 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1944-Sep-02 03:37 < 00:01 Earth 0.191638284021266 0.191638189293515 0.191638378749017 16.7374465695483 16.7366158553042 2431335.650547298 0.00602084055791932 4.98038522133283 1.02672621503299 18.9006432800989 9267400.50777707 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1951-Feb-10 07:22 < 00:01 Earth 0.461491956346253 0.46149181024526 0.461492102447245 9.17711773662424 9.17648858285232 2433687.807035240 0.034571646219027 8.98473724387416 4.79396826230273 -43.7915574996137 10309876.1020023 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1951-Aug-08 15:38 < 00:01 Earth 0.193652348818458 0.193652197315702 0.193652500321226 7.99590103526021 7.99418008262939 2433867.151418646 0.0510007567998348 7.8566041276403 4.74867634534412 20.1294844655982 4191295.17239859 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1958-Mar-18 04:43 < 00:01 Earth 0.151504383597846 0.151504172783324 0.151504594412619 9.05536855072033 9.05342620019568 2436280.696561938 0.0201054364396347 14.3914465692635 2.02850885788774 -43.6079661318609 7152822.61749804 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1962-Sep-13 21:32 < 00:01 Earth 0.436384637621364 0.436384423973021 0.436384851269706 23.559514282058 23.5592551155008 2437921.396945741 0.0139024475253222 10.7077773223728 1.48850884051988 5.81976784337467 6773592.44779897 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1965-Mar-04 20:24 < 00:01 Earth 0.272661122284212 0.272660843846407 0.272661400722032 18.7506267210882 18.750105551115 2438824.349850364 0.0148421034597664 14.3179293716363 3.70329901340009 14.6464128536785 3555052.47294175 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1969-Aug-27 00:06 < 00:01 Earth 0.0606033683103868 0.0606031612703614 0.060603575350712 13.1765393146501 13.1732022145793 2440460.504230234 0.0171960714527592 12.32499997279 1.04167110026173 33.2456020864069 4355360.7704764 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1976-Feb-22 11:52 < 00:01 Earth 0.384692327956277 0.384692161792236 0.384692494120339 8.45407229778243 8.45325297709767 2442830.994268550 0.0380553177865995 10.1809622471234 3.93825902101592 -39.0647763506585 9971320.68877534 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1976-Jun-23 12:31 < 00:01 Earth 0.271127053695513 0.271126954592803 0.271127152798239 8.53303436297393 8.53188259415092 2442953.021350523 0.0835987128590192 5.86952814468131 1.87514432382264 34.7162936939687 9892120.17453719 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1983-Mar-16 10:22 < 00:01 Earth 0.0894588376350682 0.0894587737909689 0.0894589014792386 11.0596613845443 11.0569679888515 2445409.931793093 0.0133235246336315 8.20738779683975 2.69597980577017 -77.3820219530364 4425464.90148603 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1987-Sep-10 22:36 < 00:01 Earth 0.36212426701398 0.362124191834765 0.362124342193194 21.4485046086738 21.4481615557049 2447049.441443566 0.00535564031573697 3.84467094023102 1.38353974565825 13.7574909645822 14853424.4812566 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1990-Mar-02 19:44 < 00:01 Earth 0.334198475109179 0.334198330646605 0.334198619571752 20.5262712890277 20.5258828687116 2447953.322439915 0.00748723756768066 7.21297924686823 3.70329736796036 3.390399409939 6519847.22407452 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 1994-Aug-25 10:10 < 00:01 Earth 0.0333047340892488 0.0333047146569191 0.0333047535215785 12.217234655611 12.2106845257933 2449589.923512237 0.00582525886979095 1.89553308351375 0.954989140582168 84.2753955100227 4817030.37274189 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2001-Feb-20 23:36 < 00:01 Earth 0.391083581860591 0.391083478940238 0.391083684780988 8.54119976103305 8.54040205261631 2451961.483391141 0.0228926586854388 7.91490839276252 2.82334293273139 -54.5811872547222 18279269.0039416 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2001-Jun-27 11:35 < 00:01 Earth 0.267086688196019 0.267086606710291 0.267086769681746 8.50067990983796 8.4995062657055 2452087.982938692 0.0454342863359627 4.52575043610663 1.73408817759088 28.4838642158561 9909219.67170159 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2008-Mar-17 11:41 < 00:01 Earth 0.125102654790135 0.125102553572046 0.125102756008309 9.74386323130537 9.74167716479121 2454542.986831232 0.0174118390169625 7.65539775809105 2.4299031982892 -52.4496491954696 5700905.46244154 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2012-Sep-14 02:56 < 00:01 Earth 0.446174744704757 0.446174588733016 0.446174900676498 23.8467223589836 23.8464719320949 2456184.622082993 0.0101012814354674 7.84267062804845 1.44967737230535 7.51564814590939 9459965.06389874 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2015-Mar-07 09:37 < 00:01 Earth 0.238422165119844 0.238422007752139 0.23842232248755 17.7053246811589 17.7046934774015 2457088.900988309 0.0138280139766166 8.24138194542076 3.76380388002724 20.0915810366497 4743833.09748335 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2019-Aug-31 17:20 < 00:01 Earth 0.137257679947352 0.137257480567486 0.137257879327235 15.2835419484623 15.2822717553985 2458727.222507886 0.0133286228447816 10.3199040213165 1.09028895974455 15.6448411319878 4878183.18483944 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2026-Feb-09 02:21 < 00:01 Earth 0.472932388230081 0.472932272813688 0.472932503646475 9.31184564425415 9.3112405937309 2461080.598212445 0.0274549049862397 7.47009648790249 4.7180633507648 -55.3197494501905 11365309.9588534 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2026-Aug-12 08:35 < 00:01 Earth 0.170437087393535 0.170436860119715 0.170437314667355 8.3615424193466 8.35967255363374 2461264.857866522 0.0444102768238071 11.3356295335467 2.59943859229637 0.774372621870665 2709473.16983695 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2033-Mar-14 23:04 < 00:01 Earth 0.245392733398888 0.245392552488307 0.245392914309594 7.73712387152177 7.73572037771584 2463671.461321319 0.0378188668253722 12.883538453395 2.10353804756669 -46.3526220555481 8274865.22044474 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2033-Sep-23 08:08 < 00:01 Earth 0.454800568974705 0.454800410336983 0.454800727612427 8.07980018269551 8.07907506212573 2463863.838987214 0.042798325604757 8.59190665011939 6.93750761467794 -41.45866125453 5739460.46661573 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2040-Mar-12 10:58 < 00:01 Earth 0.113638246622185 0.113638108998593 0.113638384245899 13.7429946730896 13.7412884594304 2466225.957052280 0.0167067793676159 9.59910124810045 3.4195558201604 48.4465850698304 3582581.75352601 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2044-Sep-06 21:24 < 00:01 Earth 0.281446863497475 0.281446651714349 0.2814470752806 19.2045672038184 19.2040742377884 2467865.391955648 0.013609984925515 10.6871045289272 1.22523807129593 8.88409901358337 5944464.15609815 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 2047-Feb-28 15:33 < 00:01 Earth 0.403495184946643 0.403495025525287 0.403495344367999 22.5440036768601 22.5437107590524 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06:44:13 2020-Oct-02 06:44 2197-Mar-02 20:06 < 00:01 Earth 0.388511292469292 0.38851089583591 0.388511689102696 22.0537279288412 22.0534169507742 2523559.337694508 0.0311737828276182 20.3271207492893 4.04411985293226 13.6229317976336 3951638.92691756 T 610 CATAB v2.0f-lin.ifort 2020-Oct-02 06:44:13 2020-Oct-02 06:44 Alternate Designations  1951 RA = 1983 CY3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-27 05:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin