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2204 Lyyli (1943 EQ)
Classification: Mars-crossing Asteroid          SPK-ID: 2002204
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4076654795981293 4.4298e-08  
a 2.588179396121421 1.3155e-08 AU
q 1.533068001315586 1.1332e-07 AU
i 20.56223601636536 7.0088e-06 deg
node 160.460517417961 1.5409e-05 deg
peri 283.2730228452624 1.9163e-05 deg
M 113.6242643190981 1.5823e-05 deg
tp 2456520.480838718633
(2013-Aug-15.98083872)
6.365e-05 JED
period 1520.862635255335
4.16
1.1595e-05
3.175e-08
d
yr
n .236707768114482 1.8046e-09 deg/d
Q 3.643290790927257 1.8517e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1211  
   data-arc span      26385 days (72.24 yr)  
   first obs. used      1943-03-03  
   last obs. used      2015-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48955  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:38:19  

Additional Information
 Earth MOID = .684118 AU 
 T_jup = 3.216 
[ 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 12.1 mag n/a MPO319110  
diameter diameter 25.16 km 2.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
rotation period rot_per 11.063 h n/a LCDB (Rev. 2015-May); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2010) Minor Planet Bul. 37, 161-165.]
geometric albedo albedo 0.0232   0.005 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
SMASSII spectral type spec_B X   n/a Xu et al. (1995) Icarus 115, 1-35  

2204 Lyyli (1943 EQ)          Discovered 1943-Mar-03 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1943 EQ = 1968 DN 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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