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JPL Small-Body Database Browser
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243 Ida
Classification: Main-belt Asteroid          SPK-ID: 2000243
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 148 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04326773518695988 2.7858e-08  
a 2.860838470120043 5.8143e-09 au
q 2.737056468782221 8.1815e-08 au
i 1.130237352162951 2.8166e-06 deg
node 323.6310869059391 0.0001426 deg
peri 114.0946547408161 0.00014769 deg
M 320.8397572236765 4.1092e-05 deg
tp 2459192.756622031029
(2020-Dec-09.25662203)
0.00020187 TDB
period 1767.41457724099
4.84
5.3881e-06
1.475e-08
d
yr
n .2036873547585962 6.2096e-10 deg/d
Q 2.984620471457865 6.0659e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3929  
   data-arc span      49297 days (134.97 yr)  
   first obs. used      1885-01-18  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44813  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:20:24  

Additional Information
 Earth MOID = 1.75261 au 
 Jupiter MOID = 2.12049 au 
 T_jup = 3.300 
[ hide covariance matrix ]
Orbital Elements at Epoch 2453531.5 (2005-Jun-10.0) TDB
Reference: JPL 148 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04618867088745483 2.8106e-08  
q 2.729386796207183 8.3036e-08 au
tp 2453862.241310820378
(2006-May-06.74131082)
0.00018324 TDB
node 324.2141914208277 0.00014157 deg
peri 108.5959937506222 0.00014593 deg
i 1.137563811375541 2.8188e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3929  
   data-arc span      49297 days (134.97 yr)  
   first obs. used      1885-01-18  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44813  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:20:24  

Additional Information
 Jupiter MOID = 2.12049 au 
 T_jup = 3.300 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.899501141054416E-16 -2.329042755767594E-15 -7.927807698077427E-13 1.359713040466394E-14 -1.884466860822268E-13 3.028777579512301E-16
q -2.329042755767594E-15 6.895023517325388E-15 2.476341383837576E-12 -5.19503357084938E-14 5.951610599296808E-13 -1.219551072136902E-15
tp -7.927807698077427E-13 2.476341383837576E-12 3.35764846173187E-8 4.473798150906708E-10 6.488155769419431E-9 1.020999896938027E-11
node 1.359713040466394E-14 -5.19503357084938E-14 4.473798150906708E-10 2.004213585214023E-8 -1.99497267628634E-8 -5.636824521518274E-12
peri -1.884466860822268E-13 5.951610599296808E-13 6.488155769419431E-9 -1.99497267628634E-8 2.129506641667493E-8 7.641130893861094E-12
i 3.028777579512301E-16 -1.219551072136902E-15 1.020999896938027E-11 -5.636824521518274E-12 7.641130893861094E-12 7.945845185081646E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.9   n/a MPO502155 IRAS observations used: 13
diameter diameter 32 km n/a Belton et al. (1995) Yeomans E-mail 2001-Apr-04
extent extent 59.8x25.4x18.6 km n/a Thomas et al. (1996) Icarus v.120, pp.20-32 fit ellipsoid
GM GM 0.00275 km^3/s^2 0.00035 Belton et al. (1996) Icarus v.120, pp.185-199 0.0024 < GM < 0.0031
bulk density density 2.6 g/cm^3 0.5 Belton et al. (1996) Icarus v.120, pp.185-199  
rotation period rot_per 4.634 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Gonano-Beurer, M.; Di Martino, M.; Mottola, S.; Neukum, G. (1992) Astron. Astrophys. 254, 393-396.]
[Binzel, R.P.; Slivan, S.M.; Magnusson, P.; Wisniewski, W.Z.; et al. (1993) Icarus 105, 310-325.]
[Davies, M.E.; Colvin, T.R.; Belton, M.J.S.; Veverka, J.; Thomas, P.C. (1996) Icarus 120, 33-37.]
[Cieza, L.A.; Ciliberti, L.N.; Iserte, J.A. (1999) IAPPP Comm. #74, 12-23.]
[Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Proyecto ECLA (Silvia Alonso Perez) (2011) http://www.geocities.com/proyectoecla/]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
geometric albedo albedo 0.262   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.802   0.009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.81, mean=6.76, max.=14.56) deg.
U-B UB 0.416   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=.81, mean=5.40, max.=14.56) 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)

243 Ida          Discovered 1884-Sep-29 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 DB1 = A910 CD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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