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335 Roberta (A892 RB)
Classification: Main-belt Asteroid          SPK-ID: 2000335
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1731253174141213 2.7825e-08  
a 2.475825425330469 4.9193e-09 au
q 2.04719736270818 6.8289e-08 au
i 5.101355713530261 2.9452e-06 deg
node 148.4289166584799 3.6614e-05 deg
peri 139.9952265863772 3.7889e-05 deg
M 349.7874225094055 1.0019e-05 deg
tp 2459040.865591316279
(2020-Jul-10.36559132)
3.9616e-05 TDB
period 1422.913352407222
3.90
4.2408e-06
1.161e-08
d
yr
n .2530020534215719 7.5405e-10 deg/d
Q 2.904453487952759 5.7709e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3793  
   data-arc span      46827 days (128.21 yr)  
   first obs. used      1892-09-01  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43248  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:52:51  

Additional Information
 Earth MOID = 1.0341 au 
 Jupiter MOID = 2.27803 au 
 T_jup = 3.455 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455234.5 (2010-Feb-07.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1744473936019183 2.8047e-08  
q 2.042157206670668 6.89e-08 au
tp 2454771.646524483587
(2008-Nov-01.14652448)
3.8869e-05 TDB
node 148.5152527572457 3.6705e-05 deg
peri 139.4036282345126 3.7928e-05 deg
i 5.095221389259487 2.9423e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3793  
   data-arc span      46827 days (128.21 yr)  
   first obs. used      1892-09-01  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43248  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:52:51  

Additional Information
 Jupiter MOID = 2.27803 au 
 T_jup = 3.455 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.866524972335731E-16 -1.929195657149884E-15 -2.876787889561298E-13 -1.544691706057495E-15 -4.25965562414627E-14 -8.882274604914271E-16
q -1.929195657149884E-15 4.747234052349097E-15 6.897940853331386E-13 3.092316291619952E-15 1.019933161070347E-13 2.146586080249648E-15
tp -2.876787889561298E-13 6.897940853331386E-13 1.510794545889769E-9 1.649973292206999E-12 3.804307406740482E-10 1.700841031371119E-12
node -1.544691706057495E-15 3.092316291619952E-15 1.649973292206999E-12 1.347240189461273E-9 -1.34145520939935E-9 1.867038144417923E-11
peri -4.25965562414627E-14 1.019933161070347E-13 3.804307406740482E-10 -1.34145520939935E-9 1.438542342808211E-9 -1.819291267239164E-11
i -8.882274604914271E-16 2.146586080249648E-15 1.700841031371119E-12 1.867038144417923E-11 -1.819291267239164E-11 8.656994837507698E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.1   n/a MPO492752 IRAS observations used: 17
diameter diameter 97.109 km 0.850 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.054 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D.; Roy, R.; Dyvig, R.; Reddy, V.; et al. (2007) Minor Planet Bull. 34, 99.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.]
[Pilcher, F.; Martinez, L. (2015) Minor Planet Bull. 42, 239.]
geometric albedo albedo 0.049   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.624   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.36, mean=6.66, max.=21.17) deg.
U-B UB 0.235   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.36, mean=6.66, max.=21.17) deg.
Tholen spectral type spec_T FP   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   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)

335 Roberta (A892 RB)          Discovered 1892-Sep-01 by Staus, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A892 RB = 1956 EB1 = 1973 KE = A910 EC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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