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121 Hermione (A872 JA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000121
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 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .129838698540985 2.8441e-08  
a 3.461567483880808 1.0639e-08 au
q 3.012122066861932 1.0057e-07 au
i 7.584410069410606 3.133e-06 deg
node 73.11273180859081 2.2269e-05 deg
peri 296.874018719989 2.5514e-05 deg
M 281.2343021439652 1.3661e-05 deg
tp 2459515.185881656391
(2021-Oct-27.68588166)
9.0636e-05 TDB
period 2352.380826168283
6.44
1.0845e-05
2.969e-08
d
yr
n .1530364454578523 7.0551e-10 deg/d
Q 3.911012900899685 1.202e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3928  
   data-arc span      54218 days (148.44 yr)  
   first obs. used      1872-06-07  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:51:09  

Additional Information
 Earth MOID = 2.02248 au 
 Jupiter MOID = 1.60425 au 
 T_jup = 3.106 
[ 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 7.3   n/a MPO473762 IRAS observations used: 16
diameter diameter 209.00 km 4.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
rotation period rot_per 5.55128 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Piironen, J.; Bowell, E.; Erikson, A.; Magnusson, P. (1994) Astron. Astrophys. Suppl. Ser. 106, 587-595.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; et al. (2005) Icarus 178, 450-464.]
[Descampes, P.; Marchis, F.; Durech, J.; Emery, J.; et al. (2009) Icarus 203, 88-101.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Li, B.; Zhao, H.; Yao, J. (2011) Minor Planet Bull. 38, 179-180.]
[Sergison, D. (2011) www.gothersobservatory.org.uk/lightcurves.htm]
[Kaasalainen, M.; Viikinkoski, M. (2012) Astron. Astrophys. 543, A97.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.0482   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
B-V BV 0.739   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg.
U-B UB 0.425   0.087 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   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)

121 Hermione (A872 JA)          Discovered 1872-May-12 by Watson, J. C. at Ann Arbor
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
1908-Dec-04 01:04 00:02 Jupiter 1.59485972899797 1.59485931519703 1.59486014279927 1.5878153630942 1.20787706960005 2418279.544535072 2.00328681197677 202.872868450614 35.3384195640816 -57.0621772880857 3089124.13074151 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1923-Jan-18 00:40 00:02 Jupiter 1.60780753160358 1.60780712373792 1.60780793946925 2.1731702539443 1.91547180781729 2423437.527810751 1.60244117221856 88.0037768207495 19.2789328816595 84.8762194415933 2066829.2273962 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1936-Dec-28 08:02 00:01 Jupiter 1.82507596840179 1.82507542477657 1.82507651202742 3.41569751067136 3.27700843291857 2428530.834659712 1.26369617727671 62.495062819435 10.7650243248065 72.1757477419183 4052244.07188757 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1950-Nov-13 20:56 < 00:01 Jupiter 1.97361229730768 1.97361195542285 1.97361263919262 4.35329851519176 4.25357032835292 2433599.371896837 0.962849097471275 42.8881799257059 12.6826154241373 78.3049784796191 5617808.22083718 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1964-Sep-13 01:02 < 00:01 Jupiter 1.87276579176187 1.87276546593755 1.87276611758619 4.2888211062457 4.18203514262081 2438651.543217292 0.73529346072905 38.2442104588581 14.1709960863964 -85.4909951529487 5103522.14997101 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1978-Aug-06 11:35 < 00:01 Jupiter 1.68874526258594 1.68874490709476 1.68874561807703 2.79756783921684 2.61213466861816 2443726.982556053 0.600838812888673 36.8352840381204 9.50431818328749 -81.71077615989 3079720.31025868 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
1992-Sep-19 12:20 < 00:01 Jupiter 1.57799284775145 1.57799247615084 1.57799321935214 1.48311024067645 1.06116530753105 2448885.013630409 0.435668968277117 140.117021091952 79.1384421200653 -76.6523802828669 2954036.40967566 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2006-Oct-07 09:21 < 00:01 Jupiter 1.64079011355207 1.64078979452963 1.64079043257451 2.54486509039237 2.33321268945692 2454015.889755252 0.236366021808309 63.127645990233 8.14445556150035 81.6196021587917 3634352.61691707 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2020-Sep-12 20:32 < 00:01 Jupiter 1.88203993611448 1.88203959513213 1.88204027709683 3.65700212173612 3.53179181454915 2459105.355265875 0.290785224587462 29.8242999288354 13.0118232603535 76.4626729829371 4988420.66381254 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2034-Jul-26 05:31 < 00:01 Jupiter 1.96490518156235 1.96490485629741 1.96490550682728 4.51250207461383 4.41593975735678 2464169.729569113 0.463228617743996 36.084111333271 14.7817831813294 88.8001040265675 5769446.82868775 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2048-May-21 11:46 < 00:01 Jupiter 1.82090951873578 1.82090922036529 1.82090981710618 4.01008832881565 3.89236166742077 2469217.990567788 0.661821197941313 34.8831982997052 12.6107994497873 -85.0615301024641 5133973.40646657 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2062-May-05 21:46 < 00:01 Jupiter 1.66543433165721 1.66543399515788 1.66543466815655 2.20508812158036 1.96092694960775 2474315.407012445 0.964676174971663 52.1284092971804 7.20924471590973 -72.4890685440702 3184370.76523279 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2076-Jun-27 14:51 00:01 Jupiter 1.56520004304805 1.56519969822701 1.56520038786926 1.7727284888985 1.43535631512853 2479482.119007479 1.21713813398835 131.219224314329 43.2119512174309 76.961252082647 2551177.93079033 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2090-Jun-24 20:17 00:01 Jupiter 1.69422139484317 1.69422104494368 1.69422174474304 2.82687550759246 2.64411218225395 2484592.344903899 1.41040383038084 75.1251961100366 8.32877564829227 83.1556000597247 3738028.9993845 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2104-May-30 16:55 00:02 Jupiter 1.93632501386024 1.93632467790441 1.93632534981617 3.94487580916307 3.8323842139081 2489680.204931161 1.63142591573606 61.7278715761051 13.4604850726293 84.9829831282019 5468375.63079522 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2118-Apr-03 04:25 00:02 Jupiter 1.93247234680996 1.93247195735757 1.93247273626268 4.57702902427611 4.48024263940771 2494735.683842419 1.7951382497873 77.8047428556385 14.7003832094559 -81.9597324264106 5766128.68358549 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2132-Feb-03 04:08 00:02 Jupiter 1.785058726522 1.78505835876031 1.78505909428369 3.57935029919024 3.44423212795427 2499789.671894519 2.07934746614353 57.465282089952 13.003128385682 88.4135265517178 3734678.7418721 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2146-Feb-15 19:45 00:03 Jupiter 1.6403322460823 1.64033181112187 1.64033268104412 1.73107174181634 1.40137943134967 2504916.323076446 2.58775391971038 190.353052367169 20.3640070897988 -73.2943607663029 3493457.41081807 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2160-Mar-25 12:05 00:03 Jupiter 1.55714038414994 1.5571400550647 1.55714071323536 2.11047314522143 1.83471423967428 2510068.003244786 2.65692845493339 98.7852256423671 32.265249940196 86.6679412696082 1983784.78455258 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2174-Mar-14 12:25 00:03 Jupiter 1.77114748971576 1.77114682500048 1.77114815443336 3.07092548795258 2.91103346618783 2515170.017342269 2.88136789265553 120.587465973786 9.19202676942687 79.0242787145977 4086945.80425384 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51
2188-Feb-13 23:53 00:03 Jupiter 1.94933933448422 1.94933901506881 1.94933965389974 4.22572393643674 4.12161464882906 2520254.495064043 3.00816877224815 115.715094182878 14.2784618690096 -89.8535524445028 5609877.88150205 T 109 CATAB v2.0f-lin.ifort 2020-Dec-18 01:51:20 2020-Dec-18 01:51

Alternate Designations
 A872 JA = 1970 VE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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