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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2376007803725809 2.9348e-08  
a 2.57445340106622 8.2795e-09 au
q 1.962761263940041 7.9271e-08 au
i 13.64466779651399 5.807e-07 deg
node 216.4816958653738 1.5787e-06 deg
peri 129.1428174975887 2.8596e-06 deg
M 354.3141505875785 5.6633e-06 deg
tp 2459224.329714129046
(2021-Jan-09.82971413)
2.3818e-05 TDB
period 1508.78021280609
4.13
7.2784e-06
1.993e-08
d
yr
n .2386033412583384 1.151e-09 deg/d
Q 3.186145538192399 1.0247e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2863  
   data-arc span      29984 days (82.09 yr)  
   first obs. used      1938-12-13  
   last obs. used      2021-01-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:30:26  

Additional Information
 Earth MOID = .986461 au 
 Jupiter MOID = 2.39634 au 
 T_jup = 3.349 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456458.5 (2013-Jun-15.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2354844817283377 2.9314e-08  
q 1.96959479103091 7.8851e-08 au
tp 2456207.971195918008
(2012-Oct-07.47119592)
1.7064e-05 TDB
node 216.6909786256748 1.5792e-06 deg
peri 129.3101794734726 2.8879e-06 deg
i 13.64723707037217 5.7944e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2863  
   data-arc span      29984 days (82.09 yr)  
   first obs. used      1938-12-13  
   last obs. used      2021-01-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:30:26  

Additional Information
 Jupiter MOID = 2.39634 au 
 T_jup = 3.349 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.592908908853833E-16 -2.306327498168128E-15 -2.256517498179255E-13 -6.968835564192535E-15 -4.294663355124305E-15 3.86155486177101E-15
q -2.306327498168128E-15 6.217441657885237E-15 5.945595235205003E-13 1.905985739083042E-14 1.230287884422109E-14 -1.050192352055725E-14
tp -2.256517498179255E-13 5.945595235205003E-13 2.911959576892041E-10 4.579124215319283E-12 3.593576274194716E-11 -1.923132724988907E-12
node -6.968835564192535E-15 1.905985739083042E-14 4.579124215319283E-12 2.493831709491245E-12 -1.970921303391148E-12 -7.671180863888557E-13
peri -4.294663355124305E-15 1.230287884422109E-14 3.593576274194716E-11 -1.970921303391148E-12 8.339730213998739E-12 6.121803436494171E-13
i 3.86155486177101E-15 -1.050192352055725E-14 -1.923132724988907E-12 -7.671180863888557E-13 6.121803436494171E-13 3.357537976056188E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.82   n/a E2021B10  
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. 2020-October); 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.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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