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1777 Gehrels (4007 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001777
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01847925740008717 3.1012e-08  
a 2.625418831772442 7.3233e-09 au
q 2.576903041397083 8.2247e-08 au
i 3.147403869856471 3.6045e-06 deg
node 334.5398320353436 6.333e-05 deg
peri 135.2258402419452 0.00012142 deg
M 265.1146391890106 0.00010382 deg
tp 2459410.036895288134
(2021-Jul-14.53689529)
0.0004483 TDB
period 1553.804307045991
4.25
6.5012e-06
1.78e-08
d
yr
n .2316894079695355 9.694e-10 deg/d
Q 2.673934622147801 7.4586e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3250  
   data-arc span      42027 days (115.06 yr)  
   first obs. used      1905-10-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39937  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:02:40  

Additional Information
 Earth MOID = 1.59444 au 
 Jupiter MOID = 2.32496 au 
 T_jup = 3.400 
[ 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 11.6   n/a MPO448929  
diameter diameter 11.860 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.83552 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1990) http://www.asu.cas.cz/~ppravec/neo.htm]
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pravec, P.; Wolf, M.; Sarounova, L. (2005) http://www.asu.cas.cz/~ppravec/neo.htm]
[Stephens, R.D. (2005) Minor Planet Bull. 32, 66-68.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Klinglesmith III, D.A. (2017) Minor Planet Bull. 44, 127-129.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.244   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Sq   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)

1777 Gehrels (4007 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 4007 P-L = 1937 GN = 1941 BU = 1951 QB = 1958 DA = A905 UE = A923 AA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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