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122 Gerda (A872 OA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000122
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03126638617408738 3.9179e-08  
a 3.223255923402212 1.2957e-08 au
q 3.122476358963203 1.2483e-07 au
i 1.640572709999773 4.5335e-06 deg
node 178.1228215825235 0.00013863 deg
peri 321.4880990152371 0.00015336 deg
M 41.98802993041918 6.5268e-05 deg
tp 2458753.973500900248
(2019-Sep-27.47350090)
0.00038299 TDB
period 2113.686682204016
5.79
1.2745e-05
3.489e-08
d
yr
n .1703185259343241 1.027e-09 deg/d
Q 3.32403548784122 1.3362e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3261  
   data-arc span      54060 days (148.01 yr)  
   first obs. used      1872-08-01  
   last obs. used      2020-08-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49295  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:09:52  

Additional Information
 Earth MOID = 2.1354 au 
 Jupiter MOID = 1.66364 au 
 T_jup = 3.187 
[ 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 7.7   n/a MPO492749 IRAS observations used: 9
diameter diameter 70.676 km 0.912 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.685 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Di Martino, M.; Blanco, C.; Riccioli, D.; De Sanctis, G. (1994) Icarus 107, 269-275.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Buchheim, R.K.; Roy, R.; Behrend, R. (2007) Minor Planet Bull. 34, 13-14.]
[Shevchenko, V.G.; Tungalag, N.; Chiorny, V.G.; Gaftonyuk, N.M.; et al. (2008) ACM 2008, 8106.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Robinson, L. (2011) http://btboar.tripod.com/lightcurves/]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Devogele, M.; Tanga, P.; Bendjoya, P.; Rivet, J.P.; et al. (2017) ArXiv:1707.07503.]
geometric albedo albedo 0.297   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.776   0.136 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=8.47, mean=12.20, max.=15.94) deg.
U-B UB 0.410   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.47 deg.
Tholen spectral type spec_T ST   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B L   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)

122 Gerda (A872 OA)          Discovered 1872-Jul-31 by Peters, C. H. F. at Clinton
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
2001-Jul-14 17:06 < 00:01 Jupiter 1.97046253096974 1.97046216350785 1.97046289843164 3.70008215349144 3.58202295608929 2452105.212492176 0.249417658462403 38.7347291369214 14.8595667027561 86.1716826187696 4410400.63355338 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2012-Oct-17 04:33 < 00:01 Jupiter 1.85498756804029 1.85498720984521 1.85498792623537 3.31760343989024 3.17698829727138 2456217.689383354 0.197828027411897 38.6292353806245 13.0405975501944 86.8890438200814 4024807.36696983 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2024-Jan-27 17:42 < 00:01 Jupiter 1.76332974863592 1.7633293860849 1.76333011118685 3.01303185500653 2.84914951155098 2460337.237623277 0.337297642558679 39.5257246242131 11.5032203266404 87.9323442142265 3628065.27383588 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2035-May-17 09:15 < 00:01 Jupiter 1.70539972667208 1.70539936000334 1.70540009334083 2.81511054198274 2.63277523686103 2464464.885338651 0.559391501067709 44.900990594624 10.1710997589773 -89.9511234078335 3391612.38876344 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2046-Sep-07 22:33 < 00:01 Jupiter 1.6896399683889 1.6896395830752 1.6896403537026 2.74405538336117 2.55484497479909 2468596.439471587 0.823724087670197 55.1431419969168 9.62847943206559 -85.9946885753805 3348560.15944623 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2057-Dec-31 11:23 00:01 Jupiter 1.71540698899467 1.7154065280882 1.71540744990142 2.80402309338757 2.6220218353088 2472728.973994999 1.12221902314074 66.3536881868731 9.99108576189882 -81.2988610609909 3427436.73196464 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2069-Apr-19 12:06 00:01 Jupiter 1.77697915792607 1.77697855734563 1.776979758507 2.98996071665897 2.82604608934723 2476856.004071441 1.43724595535113 71.3983703553809 12.0670291344042 -75.4990433054754 3475258.73942782 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2080-Jul-29 14:00 00:02 Jupiter 1.87451984032701 1.87451908559552 1.87452059505882 3.30635441643275 3.16674239775098 2480975.083591429 1.73565580493353 64.8986857510552 17.3144030141254 -66.7694298100315 3222614.896383 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10
2091-Nov-01 13:52 00:02 Jupiter 1.99376404930778 1.9937631887166 1.99376490989897 3.71419918680871 3.59799997607639 2485087.077767144 1.99178603615019 50.532714683781 27.1062996461005 -53.5813628453558 2594438.47773406 T 41 CATAB v2.0f-lin.ifort 2020-Aug-24 22:10:32 2020-Aug-24 22:10

Alternate Designations
 A872 OA = 1948 TQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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