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3959 Irwin (1954 UN2)
Classification: Main-belt Asteroid          SPK-ID: 2003959
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1880375410199253 1.2988e-08  
a 2.25829635051255 4.997e-09 au
q 1.833651857867899 2.9687e-08 au
i 3.283888457320214 7.1531e-07 deg
node 210.8377491902111 6.5952e-06 deg
peri 198.3123158748864 9.3712e-06 deg
M 221.9378273969997 4.0148e-06 deg
tp 2459871.881228338295
(2022-Oct-19.38122834)
1.4586e-05 TDB
period 1239.566486425602
3.39
4.1142e-06
1.126e-08
d
yr
n .2904241151582692 9.6394e-10 deg/d
Q 2.682940843157201 5.9366e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2415  
   data-arc span      24348 days (66.66 yr)  
   first obs. used      1954-10-28  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47775  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 22:51:40  

Additional Information
 Earth MOID = .843622 au 
 Jupiter MOID = 2.69333 au 
 T_jup = 3.596 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.03   n/a E2021B10  
diameter diameter 4.141 km 0.331 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.259   0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3959 Irwin (1954 UN2)          Discovered 1954-Oct-28 by Goethe Link Observatory at Brooklyn
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1954 UN2 = 1981 TP4 = 1981 UX10 = 1986 CY1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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