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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 ]

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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.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2228283958948514 1.6259e-08  
a 2.441674585041137 2.7387e-09 au
q 1.897600153959194 4.0688e-08 au
i 8.512720149918318 3.743e-07 deg
node 84.18623214805662 3.0372e-06 deg
peri 237.1478356080535 5.6326e-06 deg
M 49.17641298198984 7.526e-06 deg
tp 2459206.136164050965
2.889e-05 TDB
period 1393.574211416174
n .2583285461591326 4.3463e-10 deg/d
Q 2.985749016123081 3.3489e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3056  
   data-arc span      60260 days (164.98 yr)  
   first obs. used      1856-06-20  
   last obs. used      2021-06-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54792  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 09:16:06  

Additional Information
 Earth MOID = .899603 au 
 Jupiter MOID = 2.35843 au 
 T_jup = 3.452 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.58   n/a E2021B10 IRAS observations used: 4
diameter diameter 110.997 km 1.378 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 13.590 h n/a LCDB (Rev. 2020-October); 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,]
[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.]
[Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.]
geometric albedo albedo 0.139   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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

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