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757 Portlandia (A908 TG)
Classification: Main-belt Asteroid          SPK-ID: 2000757
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 75 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1095115315562061 3.6243e-08  
a 2.372593902957856 5.9389e-09 au
q 2.112767510884024 8.5222e-08 au
i 8.169090241095905 4.3088e-06 deg
node 22.50617507857915 2.164e-05 deg
peri 43.81233619065429 2.7164e-05 deg
M 151.3708717896606 1.6879e-05 deg
tp 2458439.228030940279
(2018-Nov-16.72803094)
6.2014e-05 TDB
period 1334.853307459785
3.65
5.012e-06
1.372e-08
d
yr
n .2696925557199069 1.0126e-09 deg/d
Q 2.632420295031687 6.5893e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3182  
   data-arc span      39296 days (107.59 yr)  
   first obs. used      1912-12-31  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43638  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:21:34  

Additional Information
 Earth MOID = 1.13362 au 
 Jupiter MOID = 2.65026 au 
 T_jup = 3.522 
[ 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 10.1   n/a MPO473772 IRAS observations used: 9
diameter diameter 32.894 km 0.240 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.5837 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lagerkvist, C.-I.; Bel'skaya, I.; Erikson, A.; Schevchenko, V.; et al. (1998) Astron. Astrophys. Suppl. Ser. 131, 55-62.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2006) IAU 2006, poster paper.]
[Stephens, R.D. (2015) Minor Planet Bull. 42, 104-106.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.217   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.674   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=26.99 deg.
U-B UB 0.242   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=26.99 deg.
Tholen spectral type spec_T XF   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Xk   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)

757 Portlandia (A908 TG)          Discovered 1908-Sep-30 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A908 TG = 1931 CF = A912 YA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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