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42 Isis (A856 KB)
Classification: Main-belt Asteroid          SPK-ID: 2000042
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 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2230467678627158 2.8944e-08  
a 2.442059507991996 3.1246e-09 au
q 1.897366027805967 7.0909e-08 au
i 8.514364351055043 3.3522e-06 deg
node 84.19775098045095 2.1331e-05 deg
peri 237.2569090770828 2.2614e-05 deg
M 306.8146352032637 9.2665e-06 deg
tp 2459206.431333808153
(2020-Dec-22.93133381)
3.6114e-05 TDB
period 1393.903763831744
3.82
2.6752e-06
7.324e-09
d
yr
n .2582674710701585 4.9567e-10 deg/d
Q 2.986752988178024 3.8215e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3010  
   data-arc span      59993 days (164.25 yr)  
   first obs. used      1856-06-20  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54405  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:02  

Additional Information
 Earth MOID = .900072 au 
 Jupiter MOID = 2.35898 au 
 T_jup = 3.452 
[ 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 7.5   n/a MPO473760 IRAS observations used: 4
diameter diameter 110.997 km 1.378 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 13.590 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J. (1979) Icarus 38, 100-105.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Denchev, P.; Magnusson, P.; Donchev, Z. (1998) Planet. Space Sci. 46, 673-682.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[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 0.139   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.874   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg.
U-B UB 0.462   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
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)

42 Isis (A856 KB)          Discovered 1856-May-23 by Pogson, N. R. at Oxford
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A856 KB = 1939 GM = 1950 DD1 = A910 TA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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