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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4076654730999731 4.4203e-08  
a 2.5881793944859 1.3134e-08 AU
q 1.533068017165204 1.131e-07 AU
i 20.56223602951204 6.7247e-06 deg
node 160.4605175349643 1.5405e-05 deg
peri 283.2730163146812 1.8952e-05 deg
M 113.6242693522477 1.5675e-05 deg
tp 2456520.480817910496
(2013-Aug-15.98081791)
6.3019e-05 JED
period 1520.862633813741
4.16
1.1577e-05
3.17e-08
d
yr
n .2367077683388525 1.8018e-09 deg/d
Q 3.643290771806597 1.8489e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1227  
   data-arc span      26407 days (72.30 yr)  
   first obs. used      1943-03-03  
   last obs. used      2015-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49344  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:41:36  

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-July); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2010) Minor Planet Bul. 37, 161-165.]
[Warner, B.D. (2015) http://www.minorplanetobserver.com/PDO/PDOLig htcurves.htm]
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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