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1473 Ounas (1938 UT)
Classification: Main-belt Asteroid          SPK-ID: 2001473
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .237844337449192 4.3959e-08  
a 2.57483645871334 8.8283e-09 au
q 1.962426187150642 1.1668e-07 au
i 13.64581349909448 4.4039e-06 deg
node 216.5095706452345 1.618e-05 deg
peri 129.1583919408856 1.7849e-05 deg
M 306.5851125544971 8.8054e-06 deg
tp 2459224.414758091454
(2021-Jan-09.91475809)
3.7523e-05 TDB
period 1509.116966597858
4.13
7.7615e-06
2.125e-08
d
yr
n .2385500978175213 1.2269e-09 deg/d
Q 3.187246730276038 1.0928e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2715  
   data-arc span      29897 days (81.85 yr)  
   first obs. used      1938-12-13  
   last obs. used      2020-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40411  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:37  

Additional Information
 Earth MOID = .987723 au 
 Jupiter MOID = 2.39449 au 
 T_jup = 3.349 
[ 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 11.8   n/a MPO473783  
diameter diameter 18.164 km 0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 139.1 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F.; Benishek, V.; Ferrero, A. (2013) Minor Planet Bull. 40, 126-129.]
geometric albedo albedo 0.110   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1473 Ounas (1938 UT)          Discovered 1938-Oct-22 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1938 UT = 1950 NZ = 1950 PB1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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