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7859 Lhasa (1979 US)
Classification: Main-belt Asteroid          SPK-ID: 2007859
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1326982453125874 1.9449e-08  
a 2.762964911895665 9.7359e-09 au
q 2.396324316226862 5.5509e-08 au
i 3.74012609986138 3.3398e-07 deg
node 7.967165194931243 8.1296e-06 deg
peri 36.68292758034574 1.0466e-05 deg
M 339.1757969853111 7.833e-06 deg
tp 2459297.534767506184
(2021-Mar-24.03476751)
3.6581e-05 TDB
period 1677.495953990924
4.59
8.8665e-06
2.428e-08
d
yr
n .2146055846772836 1.1343e-09 deg/d
Q 3.129605507564467 1.1028e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2265  
   data-arc span      24834 days (67.99 yr)  
   first obs. used      1953-02-15  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46554  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:06:03  

Additional Information
 Earth MOID = 1.40558 au 
 Jupiter MOID = 2.26636 au 
 T_jup = 3.325 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457166.5 (2015-May-24.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1356180526455621 1.9641e-08  
q 2.388455891755832 5.6179e-08 au
tp 2457613.261963845664
(2016-Aug-12.76196385)
3.4827e-05 TDB
node 8.255959736886446 8.1042e-06 deg
peri 35.32625234968889 1.0289e-05 deg
i 3.748474953388639 3.3381e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2265  
   data-arc span      24834 days (67.99 yr)  
   first obs. used      1953-02-15  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46554  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:06:03  

Additional Information
 Jupiter MOID = 2.26636 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.85781499785355E-16 -1.091365684314941E-15 -3.522203333876952E-13 2.373446538024454E-15 -3.494011133650397E-14 9.712552344852231E-18
q -1.091365684314941E-15 3.156111945621806E-15 9.599862836820375E-13 -7.058493814951199E-15 8.783652100535259E-14 -4.374575914631337E-17
tp -3.522203333876952E-13 9.599862836820375E-13 1.212914570484093E-9 1.006904258549386E-11 2.094057020201966E-10 8.180168908299083E-13
node 2.373446538024454E-15 -7.058493814951199E-15 1.006904258549386E-11 6.567834428748012E-11 -6.395373846431149E-11 -1.061492348256604E-12
peri -3.494011133650397E-14 8.783652100535259E-14 2.094057020201966E-10 -6.395373846431149E-11 1.058634716089628E-10 1.241619230462419E-12
i 9.712552344852231E-18 -4.374575914631337E-17 8.180168908299083E-13 -1.061492348256604E-12 1.241619230462419E-12 1.114290937356933E-13

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 13.50   n/a E2021B10  
diameter diameter 16.00 km 1.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 10.70350 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.0330   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

7859 Lhasa           Discovered 1979 Oct. 19 by A. Mrkos at Klet.
Lhasa, "God's ground", is the capital of Tibet, located on a fertile plain 3700 meters high, surrounded on all sides by hills. The main roads radiate from the great four-storey temple dating to the year 652. The name was suggested by J. Ticha and M. Tichy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000523/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1979 US = 1974 RG = 1981 ET1 = 1992 OA10 = 1993 WP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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