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42 Isis
Classification: Main-belt Asteroid          SPK-ID: 2000042
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .221923473312353 2.707e-08  
a 2.443975247262977 3.5017e-09 AU
q 1.901599771700961 6.5802e-08 AU
i 8.520528556932524 3.2373e-06 deg
node 84.34229499100778 2.0999e-05 deg
peri 236.7953379611424 2.1883e-05 deg
M 150.8403463655069 6.7835e-06 deg
tp 2456415.765589985305
(2013-May-03.26558999)
2.5759e-05 JED
period 1395.544313424004
3.82
2.9993e-06
8.212e-09
d
yr
n .2579638615105892 5.5441e-10 deg/d
Q 2.986350722824994 4.2788e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1924  
   data-arc span      57805 days (158.26 yr)  
   first obs. used      1856-06-20  
   last obs. used      2014-09-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58163  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 13:44:22  

Additional Information
 Earth MOID = .904889 AU 
 T_jup = 3.451 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.53 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
diameter diameter 100.20 km 3.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
rotation period rot_per 13.597 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.1712   0.012 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
B-V BV .874 mag .012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg.
U-B UB .462 mag .022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1856-May-23 by Pogson, N. R. at Oxford
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1939 GM = 1950 DD1 = A910 TA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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