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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 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2296463643709287 1.9889e-08  
a 2.387138681262235 2.2037e-09 au
q 1.83894096186115 4.7331e-08 au
i 5.518268465603244 2.5794e-06 deg
node 259.54045180115 2.6409e-05 deg
peri 145.2407095359994 2.7074e-05 deg
M 300.7926181484873 7.0663e-06 deg
tp 2459422.058419468142
(2021-Jul-26.55841947)
2.6652e-05 TDB
period 1347.146732624748
3.69
1.8654e-06
5.107e-09
d
yr
n .2672314687640481 3.7004e-10 deg/d
Q 2.935336400663321 2.7097e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5234  
   # 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38438  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:09:28  

Additional Information
 Earth MOID = .850795 au 
 Jupiter MOID = 2.47382 au 
 T_jup = 3.492 
[ 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 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1916-Feb-15 17:06 < 00:01 Thisb 0.0208748997538021 0.0208742573756485 0.0208755421438508 4.76254206479176 4.76254199620954 2420909.212756702 0.125572921091276 44.7016101765171 19.3700763811286 50.7374588487054 132366.74129463 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
1934-Jul-23 20:09 < 00:01 Thisb 0.0174774465801555 0.0174769970121104 0.0174778961531866 4.86910635964383 4.86910627952262 2427642.339775891 0.103763361924217 36.9248750140936 19.3890011963212 -69.0465507051148 128398.721766418 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
1952-Dec-27 18:53 < 00:01 Thisb 0.0170498503955299 0.0170494497841322 0.0170502510075829 4.87418162405188 4.87418154200681 2434374.286487601 0.0958626768480437 30.2803498191347 19.4272415993438 78.5229336244832 129698.834054014 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
1971-May-31 05:20 < 00:01 Thisb 0.0196500591866048 0.0196496456299483 0.019650472743682 4.96315530547151 4.9631552355593 2441102.722304902 0.0857288031693089 24.5454542234985 19.3845204326716 -62.2266051714289 145261.942059247 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
1989-Nov-05 05:30 < 00:01 Thisb 0.0469037199615904 0.0469032995500599 0.0469041403731443 5.13721129156007 5.13721126326309 2447835.729065700 0.0781834102470365 21.4055992512249 19.3821741870351 -28.6506872695898 335855.493629798 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
2008-Apr-14 15:09 < 00:01 Thisb 0.0352585547245826 0.0352581225168995 0.03525898693235 5.05572704403928 5.0557270057897 2454571.131279089 0.0796480503484432 22.4614139009818 19.4662081798417 -34.5094494515615 246913.298748052 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
2026-Sep-19 04:25 < 00:01 Thisb 0.0390835241278257 0.0390830269287814 0.0390840213271766 5.071632500052 5.071632465654 2461302.684246150 0.0805422211604056 26.3083913102615 19.4628634754403 -29.8895924696373 243912.895285143 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
2133-Sep-11 08:06 < 00:01 Hygie 0.0494758394537722 0.0494748420107793 0.0494768369043007 3.98434136741469 3.98434117141621 2500375.837478853 0.49158103375822 59.6559642659631 19.4212981409849 35.8667428779637 244434.189181258 T 114 CATAB v2.0f-lin.ifort 2021-Apr-12 10:10:45 2021-Apr-12 10:10
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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