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7 Iris (A847 PA)
Classification: Main-belt Asteroid          SPK-ID: 2000007
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 113 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2296463643818332 1.9892e-08  
a 2.387138679978829 2.2044e-09 au
q 1.838940960846443 4.7337e-08 au
i 5.518268782925759 2.5805e-06 deg
node 259.5404535801335 2.6413e-05 deg
peri 145.2407072874994 2.7078e-05 deg
M 300.7926185896937 7.067e-06 deg
tp 2459422.058417638439
(2021-Jul-26.55841764)
2.6655e-05 TDB
period 1347.146731538341
3.69
1.8661e-06
5.109e-09
d
yr
n .2672314689795571 3.7017e-10 deg/d
Q 2.935336399111216 2.7107e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5229  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      62897 days (172.20 yr)  
   first obs. used      1848-08-23  
   last obs. used      2020-11-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38188  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:22  

Additional Information
 Earth MOID = .850795 au 
 Jupiter MOID = 2.47382 au 
 T_jup = 3.492 
[ hide covariance matrix ]
Orbital Elements at Epoch 2450129.5 (1996-Feb-16.0) TDB
Reference: JPL 113 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2302555035316681 1.985e-08  
q 1.836587894249721 4.7286e-08 au
tp 2450000.605277101923
(1995-Oct-10.10527710)
2.1506e-05 TDB
node 259.9296582649679 2.6367e-05 deg
peri 145.2949276252272 2.7036e-05 deg
i 5.52320102099305 2.5841e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      5229  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      62897 days (172.20 yr)  
   first obs. used      1848-08-23  
   last obs. used      2020-11-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38188  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:22  

Additional Information
 Jupiter MOID = 2.47382 au 
 T_jup = 3.492 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.940040877371761E-16 -9.380975820865036E-16 3.77449659184365E-14 1.828071639239037E-15 1.178956854307475E-14 6.011074675342831E-16
q -9.380975820865036E-16 2.236007176782945E-15 -8.523732678571909E-14 -4.452895156255874E-15 -2.687502892396952E-14 -1.415836098078261E-15
tp 3.77449659184365E-14 -8.523732678571909E-14 4.62525843771844E-10 -6.148012857838713E-12 1.351080998362341E-10 -7.388694907621385E-13
node 1.828071639239037E-15 -4.452895156255874E-15 -6.148012857838713E-12 6.952017735116066E-10 -6.932879537653506E-10 9.098238385262348E-12
peri 1.178956854307475E-14 -2.687502892396952E-14 1.351080998362341E-10 -6.932879537653506E-10 7.309334763299699E-10 -9.254753264062178E-12
i 6.011074675342831E-16 -1.415836098078261E-15 -7.388694907621385E-13 9.098238385262348E-12 -9.254753264062178E-12 6.677620637798962E-12

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 5.58   n/a E2021B10 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 LCDB (Rev. 2020-October); Warner et al., 2009 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...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.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Ostro, S.J.; Magri, C.; Benner, L.A.M.; Giorgini, J.D.; et al. (2010) Icarus 207, 285-294.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
[Hanuš, J.; Marsset, M.; Vernazza, P.; Viikinkoski, M.; et al. (2019) Astron. Astrophys. 624, A121.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.2766   0.030 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18
B-V BV 0.855   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=13; phase (min.=4.28, mean=18.27, max.=32.31) deg.
U-B UB 0.484   0.047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A847 PA)          Discovered 1847-Aug-13 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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