Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2378443286138174 4.6727e-08  
a 2.574836456968385 9.7904e-09 au
q 1.962426208570359 1.2259e-07 au
i 13.64581285291326 5.1242e-06 deg
node 216.5095717268657 1.7301e-05 deg
peri 129.1583903476557 1.8865e-05 deg
M 306.5851143693499 1.0145e-05 deg
tp 2459224.414750255987
(2021-Jan-09.91475026)
4.3332e-05 TDB
period 1509.116965063775
4.13
8.6073e-06
2.357e-08
d
yr
n .2385500980600178 1.3606e-09 deg/d
Q 3.187246705366411 1.2119e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2319  
   data-arc span      29634 days (81.13 yr)  
   first obs. used      1938-12-13  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43266  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:55:42  

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-02 08:22 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin