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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 127 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04143441719730059 2.9742e-08  
a 2.862142759005513 7.5652e-09 AU
q 2.743551541850646 8.6902e-08 AU
i 1.132199172379656 2.8826e-06 deg
node 324.0275757719688 0.00015041 deg
peri 110.4961991586997 0.00015618 deg
M 276.9785940904641 4.4025e-05 deg
tp 2457408.371112506457
(2016-Jan-20.87111251)
0.00021661 JED
period 1768.623391686735
4.84
7.0123e-06
1.92e-08
d
yr
n .2035481390171303 8.0703e-10 deg/d
Q 2.980733976160381 7.8787e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2428  
   data-arc span      47461 days (129.94 yr)  
   first obs. used      1885-01-18  
   last obs. used      2014-12-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52752  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:27:08  

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 LCDB (Rev. 2015-July); Warner et al., 2009 Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
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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