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JPL Small-Body Database Browser
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228 Agathe
Classification: Main-belt Asteroid          SPK-ID: 2000228
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2418057474246025 3.7959e-08  
a 2.201365940875775 4.913e-09 au
q 1.669063004187245 8.4703e-08 au
i 2.536734827933426 3.8422e-06 deg
node 313.2995731933726 7.8434e-05 deg
peri 19.02575835855305 7.8684e-05 deg
M 61.74029111941961 6.7928e-06 deg
tp 2458795.901255983711
(2019-Nov-08.40125598)
2.2348e-05 TDB
period 1192.989966688004
3.27
3.9938e-06
1.093e-08
d
yr
n .3017628061025838 1.0102e-09 deg/d
Q 2.733668877564305 6.101e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2686  
   data-arc span      46486 days (127.27 yr)  
   first obs. used      1892-10-17  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45792  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:21:34  

Additional Information
 Earth MOID = .658827 au 
 Jupiter MOID = 2.63604 au 
 T_jup = 3.625 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2   n/a MPO492751 IRAS observations used: 2
diameter diameter 9.30 km 0.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 6.484 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Ivarsen, K.; Willis, S.; Ingleby, L.; Matthews, D.; Simet, M. (2004) Minor Planet Bull. 31, 29-33.]
[Cooney, W.R. (2005) Minor Planet Bull. 32, 15-16.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Szabo, R.; Pal, A.; Sarneczky, K.; Szabo, Gy.M.; et al. (2016) Astron. Astrophys. 596, A40.]
geometric albedo albedo 0.2082   0.043 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
B-V BV 0.918   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=23.19 deg.
U-B UB 0.596   0.041 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=23.19 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
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)

228 Agathe          Discovered 1882-Aug-19 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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