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JPL Small-Body Database Browser
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122 Gerda
Classification: Outer Main-belt Asteroid          SPK-ID: 2000122
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03170015330646539 4.0725e-08  
a 3.224719232069677 1.4497e-08 au
q 3.122495138042761 1.3178e-07 au
i 1.640271664242935 4.559e-06 deg
node 178.1293826439563 0.00015385 deg
peri 321.7146667182603 0.00016902 deg
M 333.6578741042846 7.0803e-05 deg
tp 2458755.269225294504
(2019-Sep-28.76922529)
0.00041632 TDB
period 2115.126217473738
5.79
1.4263e-05
3.905e-08
d
yr
n .1702026087265735 1.1478e-09 deg/d
Q 3.326943326096593 1.4957e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2827  
   data-arc span      53782 days (147.25 yr)  
   first obs. used      1872-08-01  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52239  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:49:39  

Additional Information
 Earth MOID = 2.13584 au 
 Jupiter MOID = 1.66226 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 7.87   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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          Discovered 1872-Jul-31 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1948 TQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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