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3800 Karayusuf
Discovery  [1]
Discovered by E. F. Helin
Discovery site Palomar Obs.
Discovery date4 January 1984
Designations
(3800) Karayusuf
Named after
 Alford Karayusuf  [1]
(discoverer's friend)
1984 AB · 1975 XL4
Mars-crosser  [1] [2] [3]
Orbital characteristics  [2]
Epoch 23 March 2018 ( JD 2458200.5)
Uncertainty parameter 0
Observation arc42.47 yr (15,513 d)
Aphelion1.6974 AU
Perihelion1.4584 AU
1.5779 AU
Eccentricity0.0757
1.98 yr (724 d)
349.96 °
0° 29m 50.28s / day
Inclination14.847°
95.451°
115.76°
Physical characteristics
Mean diameter
2.51±0.25 km [4]
2.2319±0.0001 h [5] [a]
0.281 [4]
SMASS = S  [2] · S  [3] [6]
L ( SDSS-MOC) [7] [8] [9]
14.81±0.94 [9]
15.00 [1] [2] [3] [4] [10] [11]
15.40 [6]

3800 Karayusuf, provisional designation 1984 AB, is a Mars-crossing asteroid and suspected binary system from inside the asteroid belt, approximately 2.5 kilometers (1.6 miles) in diameter. It was discovered on 4 January 1984, by American astronomer Eleanor Helin at the Palomar Observatory in California. [1] The S/ L-type asteroid has a short rotation period of 2.2 hours. [3] It was named after Syrian physician Alford Karayusuf, a friend of the discoverer. [1]

Orbit and classification

Karayusuf is a Mars-crossing asteroid, a dynamically unstable group between the main-belt and the near-Earth populations, crossing the orbit of Mars at 1.66  AU. It orbits the Sun at a distance of 1.46–1.70  AU once every 2 years (724 days; semi-major axis of 1.58 AU). Its orbit has an eccentricity of 0.08 and an inclination of 15 ° with respect to the ecliptic. On 11 June 1938, Karayusuf passed 0.0151  AU (2,260,000  km; 1,400,000  mi) from Mars. [2]

The body's observation arc begins with its first observations as 1975 XL4 at Crimea–Nauchnij in December 1975, almost 12 years prior to its official discovery observation at Palomar. [1]

Naming

This minor planet was named after Syrian physician Alford Karayusuf, a supporter of the Near-earth asteroid research projects at JPL and a leader of the World Space Foundation's program of Solar System exploration. [1] The official naming citation was published by the Minor Planet Center on 2 November 1990 ( M.P.C. 17221). [12] The main-belt asteroid 5255 Johnsophie, also discovered by Helin, was named after Alford Karayusuf's children, John and Sophie (also see the asteroid's citation).

Physical characteristics

In the SMASS classification, Karayusuf is a common, stony S-type asteroid. [2] The asteroid has also been characterized as an L-type asteroid by the Sloan Digital Sky Survey and Pan-STARRS' photometric survey. [7] [8] [9]

Rotation period

In March 2008, a rotational lightcurve of Karayusuf was obtained from photometric observations by Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a well-defined rotation period of 2.2319±0.0001 hours with a rather small brightness amplitude of 0.15 magnitude ( U=3). [5] [a] The body's rotation is close to the threshold-period of that of a fast rotator, which would fly apart if they were not composed of a solid, monolithic structure.

Follow-up observations by Warner in 2010, 2014 and 2018 gave similar results. [13] [14] [b] The asteroid was also observed by Brian Skiff (2.225 h) and William Ryan (2.23 h) in 2018. [c]

Binary candidate

During Brian Warner's photometric observations, two possible mutual eclipsing/occultation events were observed, indicating that Karayusuf is a binary asteroid with a satellite in its orbit. The data, however, was insufficient to calculate a rotation period. [5] In 2010 and in 2014, when observing conditions had a nearly identical phase angle, no evidence of an orbiting minor-planet moon was found. [13] [14] The results of the 2018-observation have not yet been published. [b]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Karayusuf measures 2.51 kilometers in diameter and its surface has an albedo between 0.281, [4] while other NEOWISE observations gave a diameter of 1.624 kilometers with a not very plausible albedo of 0.657. [10] [11] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 2.97 kilometers based on an absolute magnitude of 15.0. [3]

Notes

  1. ^ a b Lightcurve plots of (3800) Karayusuf from 2008 and 2010, by B. D. Warner at the Palmer Divide Observatory.
  2. ^ a b Warner (2018) web: rotation period 2.2328±0.0004 hours with a brightness amplitude of 0.18±0.01 mag. Quality code is 3. Summary figures for (3800) Karayusuf at the LCDB.
  3. ^ Photometric observation of (3800) Karayusuf by Brian Skiff and Bill Ryan. Quality code of 3-/2. Summary figures at the LCDB.

References

  1. ^ a b c d e f g h "3800 Karayusuf (1984 AB)". Minor Planet Center. Retrieved 24 September 2018.
  2. ^ a b c d e f "JPL Small-Body Database Browser: 3800 Karayusuf (1984 AB)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 24 September 2018.
  3. ^ a b c d e "LCDB Data for (3800) Karayusuf". Asteroid Lightcurve Database (LCDB). Retrieved 24 September 2018.
  4. ^ a b c d Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics. 603: 8. arXiv: 1705.10263. Bibcode: 2017A&A...603A..55A. doi: 10.1051/0004-6361/201629917.
  5. ^ a b c Warner, Brian D. (October 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: February-May 2008". The Minor Planet Bulletin. 35 (4): 163–166. Bibcode: 2008MPBu...35..163W. ISSN  1052-8091.
  6. ^ a b Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv: 1601.02087. Bibcode: 2016Icar..268..340C. doi: 10.1016/j.icarus.2015.12.047.
  7. ^ a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode: 2010A&A...510A..43C. doi: 10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
  8. ^ a b "Asteroid 3800 Karayusuf". Small Bodies Data Ferret. Retrieved 24 September 2018.
  9. ^ a b c 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. ^ a b Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode: 2016PDSS..247.....M. Retrieved 24 September 2018.
  11. ^ a b Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: 1509.02522. Bibcode: 2015ApJ...814..117N. doi: 10.1088/0004-637X/814/2/117.
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 September 2018.
  13. ^ a b Warner, Brian D. (October 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 March - June". The Minor Planet Bulletin. 37 (4): 161–165. Bibcode: 2010MPBu...37..161W. ISSN  1052-8091.
  14. ^ a b Warner, Brian D. (July 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin. 41 (3): 144–155. Bibcode: 2014MPBu...41..144W. ISSN  1052-8091.

External links

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