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228 Agathe (A882 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000228
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2418305449733532 2.1478e-08  
a 2.201726514218539 4.3467e-09 au
q 1.669281791402789 4.8377e-08 au
i 2.536749051223351 4.3236e-07 deg
node 313.2992844533018 2.239e-05 deg
peri 19.06395204403652 2.3702e-05 deg
M 122.0384105489224 2.8462e-06 deg
tp 2458795.982301725472
(2019-Nov-08.48230173)
8.8263e-06 TDB
period 1193.283087872172
3.27
3.5337e-06
9.675e-09
d
yr
n .3016886802962587 8.9339e-10 deg/d
Q 2.734171237034289 5.3978e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3191  
   data-arc span      46906 days (128.42 yr)  
   first obs. used      1892-10-17  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43293  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:04:30  

Additional Information
 Earth MOID = .657141 au 
 Jupiter MOID = 2.63589 au 
 T_jup = 3.624 
[ 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 12.31   n/a MPCxxxxx 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. 2020-October); 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 (A882 QA)          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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