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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4071830841888549 4.3763e-08  
a 2.589137163769871 1.2928e-08 au
q 1.534884308038071 1.1183e-07 au
i 20.5622801862336 6.4867e-06 deg
node 160.4509194595082 1.5219e-05 deg
peri 283.2774886843017 1.8662e-05 deg
M 255.6153433293659 1.6405e-05 deg
tp 2458041.730150128368
(2017-Oct-15.23015013)
7.2319e-05 JED
period 1521.706916634413
4.17
1.1397e-05
3.12e-08
d
yr
n .2365764366742964 1.7719e-09 deg/d
Q 3.643390019501671 1.8192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1266  
   data-arc span      26465 days (72.46 yr)  
   first obs. used      1943-03-03  
   last obs. used      2015-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51257  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-28 15:56:47  

Additional Information
 Earth MOID = .684694 au 
 Jupiter MOID = 2.10944 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. 2016-February); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2010) Minor Planet Bul. 37, 161-165.]
[Warner, B.D. (2016) Minor Planet Bul. 43, 57-65.]
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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