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249 Ilse (A885 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000249
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2176812832803072 1.4244e-08  
a 2.378021901668445 5.3874e-09 au
q 1.860371042444581 3.3604e-08 au
i 9.621127730638422 6.8202e-07 deg
node 334.6942618573211 3.1068e-06 deg
peri 42.08111427562576 4.6642e-06 deg
M 294.5496510850628 6.079e-06 deg
tp 2459444.018335983639
(2021-Aug-17.51833598)		 2.3132e-05 TDB
period 1339.436724287692
3.67		 4.5517e-06
1.246e-08		 d
yr
n .2687696951055652 9.1334e-10 deg/d
Q 2.895672760892309 6.5601e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2918  
   data-arc span      49330 days (135.06 yr)  
   first obs. used      1885-09-12  
   last obs. used      2020-10-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39333  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:34:20  

Additional Information
 Earth MOID = .871146 au 
 Jupiter MOID = 2.61646 au 
 T_jup = 3.489 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.31   n/a E2021B10 IRAS observations used: 15
diameter diameter 34.83 km 1.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 84.94 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Pilcher, F. (2015) Minor Planet Bull. 42, 190-192.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.0428   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
B-V BV 0.750   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=17.77 deg.
U-B UB 0.330   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=17.77 deg.

249 Ilse (A885 QA)          Discovered 1885-Aug-16 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A885 QA = 1973 PB 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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