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895 Helio (A918 NA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000895
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 74 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1449097209867436 3.2519e-08  
a 3.200959973445004 1.2101e-08 au
q 2.737109756803354 1.0637e-07 au
i 26.07941239937605 3.7183e-06 deg
node 264.6871230037003 9.9158e-06 deg
peri 177.7844860893354 1.8702e-05 deg
M 122.3451039968528 1.5634e-05 deg
tp 2458289.609213098471
(2018-Jun-20.10921310)
8.9711e-05 TDB
period 2091.793418158634
5.73
1.1861e-05
3.247e-08
d
yr
n .1721011247453399 9.7589e-10 deg/d
Q 3.664810190086654 1.3854e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2661  
   data-arc span      41635 days (113.99 yr)  
   first obs. used      1906-06-21  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42129  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:22:27  

Additional Information
 Earth MOID = 1.75332 au 
 Jupiter MOID = 1.60118 au 
 T_jup = 3.020 
[ 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 8.4   n/a MPO458835  
diameter diameter 109.568 km 1.987 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.347 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Danforth, C.W. (1994) Minor Planet Bull. 21, 4-5.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Polakis, T.; Skiff, B.A. (2016) Minor Planet Bull. 43, 310.]
[Brines, P.; Lozano, J.; Rodrigo, O.; Fornas, A.; et al. (2017) Minor Planet Bull. 44, 145-149.]
geometric albedo albedo 0.071   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
Tholen spectral type spec_T FCB   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979)
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

895 Helio (A918 NA)          Discovered 1918-Jul-11 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A918 NA = A906 MB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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