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243 Ida
Classification: Main-belt Asteroid          SPK-ID: 2000243
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 125 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04143442015675768 2.9863e-08  
a 2.86214275952053 7.5815e-09 AU
q 2.743551533873934 8.7199e-08 AU
i 1.13219911909362 2.8838e-06 deg
node 324.0275811866481 0.0001509 deg
peri 110.4961918018361 0.00015668 deg
M 276.9785955498004 4.4056e-05 deg
tp 2457408.371105447056
(2016-Jan-20.87110545)
0.00021676 JED
period 1768.623392164106
4.84
7.0273e-06
1.924e-08
d
yr
n .2035481389621904 8.0876e-10 deg/d
Q 2.980733985167125 7.8956e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2376  
   data-arc span      47406 days (129.79 yr)  
   first obs. used      1885-01-18  
   last obs. used      2014-11-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53176  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:41:36  

Additional Information
 Earth MOID = 1.75827 AU 
 T_jup = 3.300 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.94 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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 0.2383   0.065 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 13
B-V BV .802 mag .009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=.81, mean=6.76, max.=14.56) deg.
U-B UB .416 mag .037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances ]
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