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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557457359658355 3.7337e-08  
a 2.637654581684759 1.0088e-08 au
q 2.226851127636608 9.9668e-08 au
i 12.72609102536446 4.8041e-06 deg
node 13.08203634258186 1.8487e-05 deg
peri 268.320245529967 2.4376e-05 deg
M 85.69435755742494 1.574e-05 deg
tp 2458628.043948265570
(2019-May-24.54394827)
6.8376e-05 TDB
period 1564.679197630288
4.28
8.9762e-06
2.458e-08
d
yr
n .2300791117727016 1.3199e-09 deg/d
Q 3.04845803573291 1.1659e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2335  
   data-arc span      32738 days (89.63 yr)  
   first obs. used      1930-12-13  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39817  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:35:56  

Additional Information
 Earth MOID = 1.25544 au 
 Jupiter MOID = 2.21689 au 
 T_jup = 3.345 
[ 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 11.4   n/a MPO435710  
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. 2019-August); 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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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