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 ]  
2333 Porthan (1943 EP)
Classification: Main-belt Asteroid          SPK-ID: 2002333
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1370828930136071 4.582e-08  
a 2.64513304985346 1.0665e-08 au
q 2.282530558973642 1.2397e-07 au
i 11.94057395922874 4.0504e-06 deg
node 39.92836071776047 1.9163e-05 deg
peri 99.26831930084535 2.5222e-05 deg
M 4.521309119099077 1.4437e-05 deg
tp 2458980.765259983709
(2020-May-11.26525998)
6.3019e-05 TDB
period 1571.338348854223
4.30
9.5037e-06
2.602e-08
d
yr
n .2291040629553159 1.3857e-09 deg/d
Q 3.007735540733278 1.2128e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3230  
   data-arc span      28096 days (76.92 yr)  
   first obs. used      1943-03-03  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39866  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:18:56  

Additional Information
 Earth MOID = 1.33089 au 
 Jupiter MOID = 2.0964 au 
 T_jup = 3.349 
[ 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 11.9   n/a MPO384770  
diameter diameter 23.473 km 0.222 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 27.784 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2016) Minor Planet Bull. 43, 227-233.]
geometric albedo albedo 0.061   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2333 Porthan (1943 EP)          Discovered 1943-Mar-03 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1943 EP = 1926 GZ = 1939 HJ = 1952 HS3 = 1954 UK2 = 1973 GT 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-27 23:54 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin