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2730 Barks (1981 QH)
Classification: Main-belt Asteroid          SPK-ID: 2002730
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1307463724985441 2.1907e-08  
a 2.721386175473637 9.9562e-09 au
q 2.365574804862772 6.1814e-08 au
i 6.429861371304331 7.3927e-07 deg
node 4.634195201673686 6.8617e-06 deg
peri 273.4023799715272 6.4912e-06 deg
M 16.90902094208884 5.4998e-06 deg
tp 2459319.480685396281
(2021-Apr-14.98068540)
2.4926e-05 TDB
period 1639.772837960291
4.49
8.9987e-06
2.464e-08
d
yr
n .2195426047231049 1.2048e-09 deg/d
Q 3.077197546084501 1.1258e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3227  
   data-arc span      24438 days (66.91 yr)  
   first obs. used      1954-07-28  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42526  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 21:56:05  

Additional Information
 Earth MOID = 1.36006 au 
 Jupiter MOID = 2.08139 au 
 T_jup = 3.337 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457023.5 (2015-Jan-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1301955018597232 2.192e-08  
q 2.36852617175685 6.1853e-08 au
tp 2457676.090768263799
(2016-Oct-14.59076826)
2.3628e-05 TDB
node 4.71496688794223 6.8749e-06 deg
peri 272.4026685901734 6.4802e-06 deg
i 6.423585597353294 7.3892e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3227  
   data-arc span      24438 days (66.91 yr)  
   first obs. used      1954-07-28  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42526  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 21:56:05  

Additional Information
 Jupiter MOID = 2.08139 au 
 T_jup = 3.337 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.804947580398525E-16 -1.342509748345137E-15 -1.55947479085723E-13 2.189671644652698E-14 -1.828760373568925E-14 -2.193689349036774E-15
q -1.342509748345137E-15 3.825780335652619E-15 4.093072155903581E-13 -5.935461540494432E-14 3.921253746819226E-14 5.945193461904903E-15
tp -1.55947479085723E-13 4.093072155903581E-13 5.58266198410798E-10 5.89964418964214E-11 4.183972626359365E-11 -6.587741520855607E-12
node 2.189671644652698E-14 -5.935461540494432E-14 5.89964418964214E-11 4.726431327715586E-11 -3.399611572488493E-11 -4.899869017666794E-12
peri -1.828760373568925E-14 3.921253746819226E-14 4.183972626359365E-11 -3.399611572488493E-11 4.199336381040294E-11 3.416119164285835E-12
i -2.193689349036774E-15 5.945193461904903E-15 -6.587741520855607E-12 -4.899869017666794E-12 3.416119164285835E-12 5.460068756560794E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.87   n/a E2021B10  
diameter diameter 15.830 km 0.120 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.084 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Simpson, G.; Chong, E.; Gerhardt, M.; Gorsky, S.; et al. (2013) Minor Planet Bull. 146-151.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.162   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B C   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)

2730 Barks (1981 QH)          Discovered 1981-Aug-30 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 QH = 1935 FQ = 1935 HC = 1963 SP = 1972 TJ5 = 1975 EM1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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