Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2178732253285228 3.5458e-08  
a 2.377080745890707 5.874e-09 au
q 1.859178496917168 8.5433e-08 au
i 9.620297868680545 4.1439e-06 deg
node 334.7085435459841 2.0898e-05 deg
peri 42.17594144306823 2.2461e-05 deg
M 240.6790828205741 9.5409e-06 deg
tp 2459444.188743358357
(2021-Aug-17.68874336)
3.6359e-05 TDB
period 1338.641634549469
3.67
4.9618e-06
1.358e-08
d
yr
n .268929331576603 9.9682e-10 deg/d
Q 2.894982994864246 7.1538e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2773  
   data-arc span      49221 days (134.76 yr)  
   first obs. used      1885-09-12  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39652  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:09:51  

Additional Information
 Earth MOID = .871478 au 
 Jupiter MOID = 2.61629 au 
 T_jup = 3.490 
[ 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 11.3   n/a MPO473764 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. 2019-August); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jul-10 16:30 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin