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8026 Johnmckay

8026 Johnmckay, provisional designation 1991 JA1, is a binary[4] Hungaria asteroid and very slow rotator from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 8 May 1991, by American astronomer Eleanor Helin at the U.S. Palomar Observatory, California, and later named for NASA test pilot John B. McKay.[2]

8026 Johnmckay
Discovery [1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date8 May 1991
Designations
(8026) Johnmckay
Named after
John B. McKay (test pilot)[2]
1991 JA1 · 1989 UF2
main-belt · (inner)[1]
Hungaria[2][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc27.33 yr (9,981 days)
Aphelion2.0697 AU
Perihelion1.7809 AU
1.9253 AU
Eccentricity0.0750
2.67 yr (976 days)
181.46°
0° 22m 8.04s / day
Inclination19.936°
217.71°
145.66°
Known satellites1 [4]
Physical characteristics
Dimensions1.690±0.239 km[5][6]
2.54 km (calculated)[3]
355±5 h[7]
372±5 h[8]
0.30 (assumed)[3]
0.815±0.196[5][6]
E[3]
14.60±0.44[9] · 14.7[5] · 14.9[1][3]

Classification and orbit

The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. Johnmckay orbits the Sun in the inner main-belt at a distance of 1.8–2.1 AU once every 2 years and 8 months (976 days). Its orbit has an eccentricity of 0.08 and an inclination of 20° with respect to the ecliptic.[1] The first observation was made at the discovering observatory in 1989, extending the asteroid's observation arc by almost 2 years prior to its discovery.[2]

Diameter estimates

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Johnmckay measures 1.7 kilometers in diameter and its surface has an exceptionally high albedo of 0.81, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for Hungaria asteroids of 0.30, and calculates a diameter of 2.5 kilometers, based on an absolute magnitude of 14.9.[3][5][6]

Lightcurves

Primary

Two rotational lightcurves of Johnmckay were obtained for this asteroid from photometric observations by U.S. astronomer Brian D. Warner at the Palmer Divide Station (PDO), Colorado. In August 2010, the first lightcurve gave a long rotation period of 372±5 hours with a brightness variation of 1.0 in magnitude (U=3).[8] The second lightcurve from June 2015, gave a similar period of 355±5 with an amplitude of 0.66 in magnitude (U=2).[7]

This makes Johnmckay one of the Top 100+ slowest rotators known to exist.

Moon

In 2010 a small asteroid moon was discovered around this asteroid. It has an orbital period of 2.300±0.001 hours,[4] while observations at the PDO gave it a period of 2.2981 and 14.93 hours, respectively.[3][7][8]

Naming

This minor planet was named in memory of NASA test pilot John B. McKay (1922–1975), one of the first pilots assigned to fly the North American X-15. He was also assigned to the X-1E and to the D-558-II. He died in 1975, from injuries he had sustained during a X-15 crash. In 2005, he received posthumous the astronaut badge for a reached peak-altitude of 89,900 metres (295,000 feet).[2] The approved naming citation was published by the Minor Planet Center on 7 February 2012 (M.P.C. 78269).[10]

References

  1. ^ a b c d e "JPL Small-Body Database Browser: 8026 Johnmckay (1991 JA1)" (2017-02-23 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
  2. ^ a b c d e "8026 Johnmckay (1991 JA1)". Minor Planet Center. Retrieved 11 August 2016.
  3. ^ a b c d e f g "LCDB Data for (8026) Johnmckay". Asteroid Lightcurve Database (LCDB). Retrieved 11 August 2016.
  4. ^ a b c Johnston, Robert. "(8026) Johnmckay". johnstonsarchive.net. Retrieved 29 May 2015.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  6. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
  7. ^ a b c Warner, Brian D. (October 2015). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 March-June". The Minor Planet Bulletin. 42 (4): 267–276. Bibcode:2015MPBu...42..267W. ISSN 1052-8091.
  8. ^ a b c Warner, Brian D. (January 2011). "A Quartet of Known and Suspected Hungaria Binary Asteroids". The Minor Planet Bulletin. 38 (1): 33–36. Bibcode:2011MPBu...38...33W. ISSN 1052-8091.
  9. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 August 2016.

External links

  • Lightcurve plot of 8026 Johnmckay (1991 JA1), Palmer Divide Observatory, B. D. Warner (2010)
  • Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
  • Asteroid Lightcurve Database (LCDB), query form (info 16 December 2017 at the Wayback Machine)
  • Dictionary of Minor Planet Names, Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
  • 8026 Johnmckay at AstDyS-2, Asteroids—Dynamic Site
    • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
  • 8026 Johnmckay at the JPL Small-Body Database  
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

8026, johnmckay, provisional, designation, 1991, binary, hungaria, asteroid, very, slow, rotator, from, inner, regions, asteroid, belt, approximately, kilometers, diameter, discovered, 1991, american, astronomer, eleanor, helin, palomar, observatory, californi. 8026 Johnmckay provisional designation 1991 JA1 is a binary 4 Hungaria asteroid and very slow rotator from the inner regions of the asteroid belt approximately 2 kilometers in diameter It was discovered on 8 May 1991 by American astronomer Eleanor Helin at the U S Palomar Observatory California and later named for NASA test pilot John B McKay 2 8026 JohnmckayDiscovery 1 Discovered byE F HelinDiscovery sitePalomar Obs Discovery date8 May 1991DesignationsMPC designation 8026 JohnmckayNamed afterJohn B McKay test pilot 2 Alternative designations1991 JA1 1989 UF2Minor planet categorymain belt inner 1 Hungaria 2 3 Orbital characteristics 1 Epoch 4 September 2017 JD 2458000 5 Uncertainty parameter 0Observation arc27 33 yr 9 981 days Aphelion2 0697 AUPerihelion1 7809 AUSemi major axis1 9253 AUEccentricity0 0750Orbital period sidereal 2 67 yr 976 days Mean anomaly181 46 Mean motion0 22m 8 04s dayInclination19 936 Longitude of ascending node217 71 Argument of perihelion145 66 Known satellites1 4 Physical characteristicsDimensions1 690 0 239 km 5 6 2 54 km calculated 3 Synodic rotation period355 5 h 7 372 5 h 8 Geometric albedo0 30 assumed 3 0 815 0 196 5 6 Spectral typeE 3 Absolute magnitude H 14 60 0 44 9 14 7 5 14 9 1 3 Contents 1 Classification and orbit 2 Diameter estimates 3 Lightcurves 3 1 Primary 3 2 Moon 4 Naming 5 References 6 External linksClassification and orbit EditThe bright E type asteroid is a member of the Hungaria family which form the innermost dense concentration of asteroids in the Solar System Johnmckay orbits the Sun in the inner main belt at a distance of 1 8 2 1 AU once every 2 years and 8 months 976 days Its orbit has an eccentricity of 0 08 and an inclination of 20 with respect to the ecliptic 1 The first observation was made at the discovering observatory in 1989 extending the asteroid s observation arc by almost 2 years prior to its discovery 2 Diameter estimates EditAccording to the survey carried out by the NEOWISE mission of NASA s Wide field Infrared Survey Explorer Johnmckay measures 1 7 kilometers in diameter and its surface has an exceptionally high albedo of 0 81 while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for Hungaria asteroids of 0 30 and calculates a diameter of 2 5 kilometers based on an absolute magnitude of 14 9 3 5 6 Lightcurves EditPrimary Edit Two rotational lightcurves of Johnmckay were obtained for this asteroid from photometric observations by U S astronomer Brian D Warner at the Palmer Divide Station PDO Colorado In August 2010 the first lightcurve gave a long rotation period of 372 5 hours with a brightness variation of 1 0 in magnitude U 3 8 The second lightcurve from June 2015 gave a similar period of 355 5 with an amplitude of 0 66 in magnitude U 2 7 This makes Johnmckay one of the Top 100 slowest rotators known to exist Moon Edit In 2010 a small asteroid moon was discovered around this asteroid It has an orbital period of 2 300 0 001 hours 4 while observations at the PDO gave it a period of 2 2981 and 14 93 hours respectively 3 7 8 Naming EditThis minor planet was named in memory of NASA test pilot John B McKay 1922 1975 one of the first pilots assigned to fly the North American X 15 He was also assigned to the X 1E and to the D 558 II He died in 1975 from injuries he had sustained during a X 15 crash In 2005 he received posthumous the astronaut badge for a reached peak altitude of 89 900 metres 295 000 feet 2 The approved naming citation was published by the Minor Planet Center on 7 February 2012 M P C 78269 10 References Edit a b c d e JPL Small Body Database Browser 8026 Johnmckay 1991 JA1 2017 02 23 last obs Jet Propulsion Laboratory Retrieved 4 July 2017 a b c d e 8026 Johnmckay 1991 JA1 Minor Planet Center Retrieved 11 August 2016 a b c d e f g LCDB Data for 8026 Johnmckay Asteroid Lightcurve Database LCDB Retrieved 11 August 2016 a b c Johnston Robert 8026 Johnmckay johnstonsarchive net Retrieved 29 May 2015 a b c d Mainzer A Grav T Masiero J Hand E Bauer J Tholen D et al November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids Preliminary Results The Astrophysical Journal 741 2 25 arXiv 1109 6407 Bibcode 2011ApJ 741 90M doi 10 1088 0004 637X 741 2 90 a b c Masiero Joseph R Mainzer A K Grav T Bauer J M Cutri R M Dailey J et al November 2011 Main Belt Asteroids with WISE NEOWISE I Preliminary Albedos and Diameters The Astrophysical Journal 741 2 20 arXiv 1109 4096 Bibcode 2011ApJ 741 68M doi 10 1088 0004 637X 741 2 68 a b c Warner Brian D October 2015 Asteroid Lightcurve Analysis at CS3 Palmer Divide Station 2015 March June The Minor Planet Bulletin 42 4 267 276 Bibcode 2015MPBu 42 267W ISSN 1052 8091 a b c Warner Brian D January 2011 A Quartet of Known and Suspected Hungaria Binary Asteroids The Minor Planet Bulletin 38 1 33 36 Bibcode 2011MPBu 38 33W ISSN 1052 8091 Veres Peter Jedicke Robert Fitzsimmons Alan Denneau Larry Granvik Mikael Bolin Bryce et al November 2015 Absolute magnitudes and slope parameters for 250 000 asteroids observed by Pan STARRS PS1 Preliminary results Icarus 261 34 47 arXiv 1506 00762 Bibcode 2015Icar 261 34V doi 10 1016 j icarus 2015 08 007 MPC MPO MPS Archive Minor Planet Center Retrieved 11 August 2016 External links EditLightcurve plot of 8026 Johnmckay 1991 JA1 Palmer Divide Observatory B D Warner 2010 Asteroids with Satellites Robert Johnston johnstonsarchive net Asteroid Lightcurve Database LCDB query form info Archived 16 December 2017 at the Wayback Machine Dictionary of Minor Planet Names Google books Asteroids and comets rotation curves CdR Observatoire de Geneve Raoul Behrend Discovery Circumstances Numbered Minor Planets 5001 10000 Minor Planet Center 8026 Johnmckay at AstDyS 2 Asteroids Dynamic Site Ephemeris Observation prediction Orbital info Proper elements Observational info 8026 Johnmckay at the JPL Small Body Database Close approach Discovery Ephemeris Orbit diagram Orbital elements Physical parameters Retrieved from https en wikipedia org w index php title 8026 Johnmckay amp oldid 1123273285, wikipedia, wiki, book, books, library,

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