3800 Karayusuf
{{Use dmy dates|date=September 2018}}
{{Infobox planet
| minorplanet = yes
| name = 3800 Karayusuf
| background = #FA8072
| image =
| image_size =
| caption =
| discoverer = E. F. Helin
| discovery_site = Palomar Obs.
| discovered = 4 January 1984
| mpc_name = (3800) Karayusuf
| alt_names = 1984 AB{{·}}{{mp|1975 XL|4}}
| pronounced =
| named_after = Alford Karayusuf
{{small|(discoverer's friend)}}
| mp_category = Mars-crosser
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 42.47 yr (15,513 d)
| aphelion = 1.6974 AU
| perihelion = 1.4584 AU
| semimajor = 1.5779 AU
| eccentricity = 0.0757
| period = 1.98 yr (724 d)
| mean_anomaly = 349.96°
| mean_motion = {{Deg2DMS|0.4973|sup=ms}} / day
| inclination = 14.847°
| asc_node = 95.451°
| arg_peri = 115.76°
| mean_diameter = {{val|2.51|0.25|u=km}}
| rotation = {{val|2.2319|0.0001|u=h}}{{efn|name=lightcurve-plot-Warner}}
| spectral_type = {{nowrap|SMASS {{=}} S{{·}}S}}
L {{small|(SDSS-MOC)}}
| abs_magnitude = {{val|14.81|0.94}}
15.00
15.40
}}
3800 Karayusuf, provisional designation {{mp|1984 AB}}, is a Mars-crossing asteroid and suspected binary system from inside the asteroid belt, approximately {{convert|2.5|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 4 January 1984, by American astronomer Eleanor Helin at the Palomar Observatory in California. The S/L-type asteroid has a short rotation period of 2.2 hours. It was named after Syrian physician Alford Karayusuf, a friend of the discoverer.
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 {{convert|0.0151|AU|km mi|abbr=on|lk=on}} from Mars.
The body's observation arc begins with its first observations as {{mp|1975 XL|4}} at Crimea–Nauchnij in December 1975, almost 12 years prior to its official discovery observation at Palomar.
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. The official naming citation was published by the Minor Planet Center on 2 November 1990 ({{small|M.P.C. 17221}}). 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 {{MoMP|5255|citation}}).
Physical characteristics
In the SMASS classification, Karayusuf is a common, stony S-type asteroid. The asteroid has also been characterized as an L-type asteroid by the Sloan Digital Sky Survey and Pan-STARRS{{'}} photometric survey.
= 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 {{val|2.2319|0.0001}} hours with a rather small brightness amplitude of 0.15 magnitude ({{small|U=3}}).{{efn|name=lightcurve-plot-Warner}} 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.{{efn|name=lcdb-Warner-2018}} The asteroid was also observed by Brian Skiff (2.225 h) and William Ryan (2.23 h) in 2018.{{efn|name=lcdb-Skiff-and-Ryan}}
= 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. In 2010 and in 2014, when observing conditions had a nearly identical phase angle, no evidence of an orbiting minor-planet moon was found. The results of the 2018-observation have not yet been published.{{efn|name=lcdb-Warner-2018}}
= 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, while other NEOWISE observations gave a diameter of 1.624 kilometers with a not very plausible albedo of 0.657. 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.
Notes
{{notelist|refs=
{{efn|name=lightcurve-plot-Warner|1=Lightcurve plots of (3800) Karayusuf from [http://www.minorplanetobserver.com/pdolc/A3800_2008.HTM 2008] and [http://www.minorplanetobserver.com/pdolc/A3800_2010.HTM 2010], by B. D. Warner at the Palmer Divide Observatory.}}
{{efn|name=lcdb-Skiff-and-Ryan|1=Photometric observation of (3800) Karayusuf by Brian Skiff and Bill Ryan. Quality code of 3-/2. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3800%7CKarayusuf LCDB].}}
{{efn|name=lcdb-Warner-2018|1=Warner (2018) web: rotation period {{val|2.2328|0.0004}} hours with a brightness amplitude of {{val|0.18|0.01}} mag. Quality code is 3. Summary figures for (3800) Karayusuf at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3800%7CKarayusuf LCDB].}}
}}
References
{{reflist|30em|refs=
|type = 2018-05-24 last obs.
|title = JPL Small-Body Database Browser: 3800 Karayusuf (1984 AB)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003800
|publisher = Jet Propulsion Laboratory
|access-date = 24 September 2018}}
|title = 3800 Karayusuf (1984 AB)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=3800
|access-date = 24 September 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 24 September 2018}}
|title = Asteroid 3800 Karayusuf
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=3800+Karayusuf
|access-date = 24 September 2018}}
|first1 = J. M. |last1 = Carvano
|first2 = P. H. |last2 = Hasselmann
|first3 = D. |last3 = Lazzaro
|first4 = T. |last4 = Mothé-Diniz
|date = February 2010
|title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids
|url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab
|journal = Astronomy and Astrophysics
|volume = 510
|page = 12
|bibcode = 2010A&A...510A..43C
|doi = 10.1051/0004-6361/200913322
|access-date= 30 October 2019|doi-access= free
}} [https://sbn.psi.edu/pds/resource/sdsstax.html (PDS data set)]
|title = LCDB Data for (3800) Karayusuf
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3800%7CKarayusuf
|access-date = 24 September 2018}}
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|arxiv = 1509.02522
}}
|display-authors = 6
|first1 = A. K. |last1 = Mainzer
|first2 = J. M. |last2 = Bauer
|first3 = R. M. |last3 = Cutri
|first4 = T. |last4 = Grav
|first5 = E. A. |last5 = Kramer
|first6 = J. R. |last6 = Masiero
|first7 = C. R. |last7 = Nugent
|first8 = S. M. |last8 = Sonnett
|first9 = R. A. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = June 2016
|title = NEOWISE Diameters and Albedos V1.0
|url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab
|journal = NASA Planetary Data System
|pages = EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 |bibcode = 2016PDSS..247.....M
|access-date= 24 September 2018}}
|first1 = V. |last1 = Alí-Lagoa
|first2 = M. |last2 = Delbo'
|date = July 2017
|title = Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data
|journal = Astronomy and Astrophysics
|volume = 603
|page = 8
|bibcode = 2017A&A...603A..55A
|doi = 10.1051/0004-6361/201629917
|arxiv = 1705.10263
}}
|author = Warner, Brian D.
|date = October 2008
|title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: February-May 2008
|journal = The Minor Planet Bulletin
|volume = 35
|issue = 4
|pages = 163–166
|issn = 1052-8091
|bibcode = 2008MPBu...35..163W
}}
|author = Warner, Brian D.
|date = October 2010
|title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 March - June
|journal = The Minor Planet Bulletin
|volume = 37
|issue = 4
|pages = 161–165
|issn = 1052-8091
|bibcode = 2010MPBu...37..161W
}}
|author = Warner, Brian D.
|date = July 2014
|title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March
|journal = The Minor Planet Bulletin
|volume = 41
|issue = 3
|pages = 144–155
|issn = 1052-8091
|bibcode = 2014MPBu...41..144W
}}
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
}}
|first1 = B. |last1 = Carry
|first2 = E. |last2 = Solano
|first3 = S. |last3 = Eggl
|first4 = F. E. |last4 = DeMeo
|date = April 2016
|title = Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry
|journal = Icarus
|volume = 268
|pages = 340–354
|bibcode = 2016Icar..268..340C
|doi = 10.1016/j.icarus.2015.12.047
|arxiv = 1601.02087
}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|3800}}
- {{JPL small body}}
{{Minor planets navigator |3799 Novgorod |number=3800 |3801 Thrasymedes}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Karayusuf}}