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7844 Horikawa (1995 YL1)
Classification: Main-belt Asteroid          SPK-ID: 2007844
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2713449952804534 3.3714e-08  
a 2.575025505337038 8.1507e-09 au
q 1.876305221744312 8.9328e-08 au
i 2.630093080567188 2.5768e-06 deg
node 248.3005462876341 8.099e-05 deg
peri 115.2827875741772 8.1178e-05 deg
M 89.83960414354631 5.7345e-06 deg
tp 2458823.851659486584
(2019-Dec-06.35165949)
2.3249e-05 TDB
period 1509.28317057339
4.13
7.166e-06
1.962e-08
d
yr
n .2385238284100344 1.1325e-09 deg/d
Q 3.273745788929763 1.0362e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2070  
   data-arc span      24660 days (67.52 yr)  
   first obs. used      1953-09-07  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50195  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:05:39  

Additional Information
 Earth MOID = .874452 au 
 Jupiter MOID = 2.2025 au 
 T_jup = 3.373 
[ 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 14.41   n/a E2021B10  
diameter diameter 2.794 km 0.361 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.393   0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

7844 Horikawa           Discovered 1995 Dec. 21 by T. Kobayashi at Oizumi.
Kuniaki Horikawa (b. 1958), a computer systems engineer in Yokohama, started Jupiter observations in 1974, and he has obtained more than 3000 drawings and 8200 central-meridian transit timings. Since 2001 he has served as director of the Jupiter-Saturn Section of the Oriental Astronomical Association.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030806/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1995 YL1 = 1982 QM3 = 1982 RQ2 = 1986 PH = 1993 FW77 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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