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9223 Leifandersson (1995 YY7)
Classification: Main-belt Asteroid          SPK-ID: 2009223
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07002568061120491 3.0841e-08  
a 2.301022478836155 6.8433e-09 au
q 2.139891813653972 6.9982e-08 au
i 3.412282557537229 4.2913e-06 deg
node 231.8182423841314 6.6982e-05 deg
peri 23.35742849623011 7.8802e-05 deg
M 168.2319326823603 4.2299e-05 deg
tp 2458404.720367338464
(2018-Oct-13.22036734)
0.00015005 TDB
period 1274.910561499138
3.49
5.6874e-06
1.557e-08
d
yr
n .2823727490159657 1.2597e-09 deg/d
Q 2.462153144018339 7.3225e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2236  
   data-arc span      25726 days (70.43 yr)  
   first obs. used      1949-08-27  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45542  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:14:24  

Additional Information
 Earth MOID = 1.12564 au 
 Jupiter MOID = 2.55271 au 
 T_jup = 3.586 
[ 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 13.6   n/a MPO502239  
diameter diameter 4.498 km 0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.758 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.381   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9223 Leifandersson           Discovered 1995 Dec. 18 by Spacewatch at Kitt Peak.
Leif Erland Andersson (1943-1979) observed that most satellites of the outer planets rotate synchronously about their parent planets, helped determine Pluto's pole position and albedo map, and determined that Pluto and its satellite Charon would display mutual transits and eclipses. He also made a catalogue of lunar craters.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000124/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1995 YY7 = 1949 QK1 = 1981 UD5 = 1988 VT10 = 1990 FD4 = 1991 RK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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