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JPL Small-Body Database Browser
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2257 Kaarina (1939 QB)
Classification: Main-belt Asteroid          SPK-ID: 2002257
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2393817899980361 3.9941e-08  
a 2.487907986256966 8.6071e-09 au
q 1.892348119156364 9.8524e-08 au
i 5.070399522183006 4.3923e-06 deg
node 233.711660621825 3.8892e-05 deg
peri 129.2028250870139 4.0107e-05 deg
M 91.11524428642092 1.2811e-05 deg
tp 2458237.724089073820
(2018-Apr-29.22408907)
4.9859e-05 TDB
period 1433.342235497778
3.92
7.4381e-06
2.036e-08
d
yr
n .2511612307823871 1.3034e-09 deg/d
Q 3.083467853357568 1.0667e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2040  
   data-arc span      29331 days (80.30 yr)  
   first obs. used      1939-08-18  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51842  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:12:33  

Additional Information
 Earth MOID = .894359 au 
 Jupiter MOID = 2.40085 au 
 T_jup = 3.429 
[ 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 13.3   n/a MPO337265  
diameter diameter 5.693 km 0.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.04866 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2006) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pravec, P.; Wolf, M.; Sarounova, L. (2010) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.314   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2257 Kaarina (1939 QB)          Discovered 1939-Aug-18 by Alikoski, H. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1939 QB = 1943 TD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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