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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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03126638623944297 3.9174e-08  
a 3.223255923297873 1.2955e-08 au
q 3.12247635865147 1.2481e-07 au
i 1.640572721314941 4.5333e-06 deg
node 178.1228207939482 0.00013861 deg
peri 321.4880997616094 0.00015334 deg
M 41.98802999501978 6.5265e-05 deg
tp 2458753.973500532926
(2019-Sep-27.47350053)
0.00038297 TDB
period 2113.686682101384
5.79
1.2743e-05
3.489e-08
d
yr
n .170318525942594 1.0268e-09 deg/d
Q 3.324035487944277 1.336e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3264  
   data-arc span      54078 days (148.06 yr)  
   first obs. used      1872-08-01  
   last obs. used      2020-08-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49278  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:09  

Additional Information
 Earth MOID = 2.1354 au 
 Jupiter MOID = 1.66364 au 
 T_jup = 3.187 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455685.5 (2011-May-04.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03904302426753058 3.8889e-08  
q 3.094983981200599 1.2553e-07 au
tp 2456654.785721191007
(2013-Dec-28.28572119)
0.00030662 TDB
node 178.4121567720904 0.00013837 deg
peri 324.6415625798207 0.00014816 deg
i 1.639750717212584 4.5465e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3264  
   data-arc span      54078 days (148.06 yr)  
   first obs. used      1872-08-01  
   last obs. used      2020-08-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49278  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:09  

Additional Information
 Jupiter MOID = 1.66364 au 
 T_jup = 3.187 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.512347308084196E-15 -4.859444236640439E-15 1.676552868564043E-12 -2.357634109594931E-16 3.076231221972059E-13 -1.040106790392691E-16
q -4.859444236640439E-15 1.575799385991502E-14 -5.195020259911944E-12 2.267797911606198E-15 -9.691532584255456E-13 1.934855880534361E-16
tp 1.676552868564043E-12 -5.195020259911944E-12 9.401473835600386E-8 -1.880482849654721E-11 1.625531610683309E-8 2.079314287556516E-12
node -2.357634109594931E-16 2.267797911606198E-15 -1.880482849654721E-11 1.91463854322591E-8 -1.914160777619441E-8 4.420326408137205E-12
peri 3.076231221972059E-13 -9.691532584255456E-13 1.625531610683309E-8 -1.914160777619441E-8 2.195181287915211E-8 -4.037122066595586E-12
i -1.040106790392691E-16 1.934855880534361E-16 2.079314287556516E-12 4.420326408137205E-12 -4.037122066595586E-12 2.067035702849606E-11

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 1.97046253136963 1.97046216398906 1.97046289875021 3.70008214775857 3.58202295019183 2452105.212491096 0.249408173934918 38.733071713505 14.8561804890118 86.1720408605173 4411306.93111283 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2012-Oct-17 04:33 < 00:01 Jupiter 1.85498756827262 1.85498721011719 1.85498792642806 3.31760345832999 3.17698831654528 2456217.689387147 0.197825659897607 38.6244771212879 13.0390630780526 86.8891342537589 4025200.42548365 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2024-Jan-27 17:42 < 00:01 Jupiter 1.76332974872319 1.76332938618078 1.7633301112656 3.01303184219756 2.84914949801358 2460337.237619346 0.337272318529713 39.5187166075466 11.5028943538041 87.931951179068 3628138.04077289 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2035-May-17 09:15 < 00:01 Jupiter 1.70539972660603 1.70539935993739 1.70540009327458 2.81511055145983 2.63277524698717 2464464.885343129 0.55934873706715 44.8943679890945 10.1710967263679 -89.9513080668171 3391614.22753748 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2046-Sep-07 22:33 < 00:01 Jupiter 1.68963996834696 1.68963958303902 1.6896403536549 2.74405538347843 2.55484497492016 2468596.439475782 0.823674370259527 55.1381275458354 9.62827981897859 -85.994275979345 3348668.95901123 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2057-Dec-31 11:23 00:01 Jupiter 1.71540698907476 1.7154065281799 1.71540744996991 2.80402309317698 2.62202183509239 2472728.973993968 1.1221693722714 66.3498026547336 9.99023457463649 -81.2979720982983 3427780.21857221 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2069-Apr-19 12:06 00:01 Jupiter 1.77697915817254 1.77697855760352 1.77697975874196 2.98996071110686 2.82604608349649 2476856.004071355 1.43719857049082 71.3952992728767 12.0652012960196 -75.4976690160871 3475823.29556317 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2080-Jul-29 14:00 00:02 Jupiter 1.8745198407339 1.87451908601029 1.87452059545782 3.306354439677 3.16674242205097 2480975.083584704 1.73560992236622 64.8968835553478 17.3123346445067 -66.76770332102 3223060.20639238 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33
2091-Nov-01 13:52 00:02 Jupiter 1.99376404988594 1.99376318929884 1.99376491047304 3.71419923152212 3.59800002226809 2485087.077757220 1.99173979357004 50.5324093355932 27.1055042860967 -53.5803471908894 2594542.9294861 T 42 CATAB v2.0f-lin.ifort 2020-Nov-13 04:33:18 2020-Nov-13 04:33

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