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7 Iris
Classification: Main-belt Asteroid          SPK-ID: 2000007
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2304649305092262 1.8229e-08  
a 2.385988714843692 1.5536e-09 AU
q 1.836101991481443 4.3501e-08 AU
i 5.524376908795847 2.4613e-06 deg
node 259.6357275189561 2.6111e-05 deg
peri 145.4366658189432 2.6685e-05 deg
M 18.71248757916454 5.8088e-06 deg
tp 2456730.527074934322
(2014-Mar-14.02707493)
2.1683e-05 JED
period 1346.173399825904
3.69
1.3148e-06
3.6e-09
d
yr
n .2674246869285619 2.612e-10 deg/d
Q 2.935875438205941 1.9117e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      4780  
   # delay obs. used      2  
   # Doppler obs. used      0  
   data-arc span      60168 days (164.73 yr)  
   first obs. used      1848-08-23  
   last obs. used      2013-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49835  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2013-Jul-16 08:46:55  

Additional Information
 Earth MOID = .847689 AU 
 T_jup = 3.493 
[ 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 5.51 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
diameter diameter 199.83 km 10.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
rotation period rot_per 7.139 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.]
[Cailliate, C. (1956) Publ. Observ. Lyon 3, fasc. 28.]
[Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.]
[Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.]
[Taylor, R.C. (1977) Astron. J. 82, 441-444.]
[Zhou, X.-z.; Yang, X.-y.; Wu, Z.-x. (1982) Acta Astron. Sin. 23, 349-352; Chin. Astron. Astrophys. 7, 129-131 (1983, 1983ChA&A...7..129Z).]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1989) Astron. Astrophys. Suppl. Ser. 78, 519-532.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Ostro, S.J.; Magri, C.; Benner, L.A.M.; Giorgini, J.D.; et al. (2010) Icarus 207, 285-294.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.2766   0.030 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV .855 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=13; phase (min.=4.28, mean=18.27, max.=32.31) deg.
U-B UB .484 mag .047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=12; phase (min.=5.26, mean=19.43, max.=32.31) 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 S   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)

7 Iris          Discovered 1847-Aug-13 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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