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1495 Helsinki (1938 SW)
Classification: Main-belt Asteroid          SPK-ID: 2001495
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1554328520219885 3.4646e-08  
a 2.638650493381768 9.0416e-09 au
q 2.228517521706213 9.1112e-08 au
i 12.72431748149676 4.0454e-06 deg
node 13.07189217014887 1.6619e-05 deg
peri 268.4326027513792 2.1223e-05 deg
M 176.6774091255311 1.452e-05 deg
tp 2458628.166531594833
(2019-May-24.66653159)
6.2123e-05 TDB
period 1565.56545624536
4.29
8.0469e-06
2.203e-08
d
yr
n .229948865161713 1.1819e-09 deg/d
Q 3.048783465057324 1.0447e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2875  
   data-arc span      33017 days (90.40 yr)  
   first obs. used      1930-12-13  
   last obs. used      2021-05-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3739  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:27:00  

Additional Information
 Earth MOID = 1.25686 au 
 Jupiter MOID = 2.21468 au 
 T_jup = 3.344 
[ 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 11.57   n/a MPCxxxxx  
diameter diameter 12.235 km 0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.33116 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Oey, J.; Behrend, R.; Pravec, P.; Teng, J.P.; et al. (2007) Minor Planet Bull. 34, 2.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.274   0.049 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1495 Helsinki (1938 SW)          Discovered 1938-Sep-21 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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