3844 Lujiaxi
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 3844 Lujiaxi
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = Purple Mountain Obs.
| discovery_site = Purple Mountain Obs.
| discovered = 30 January 1966
| mpc_name = (3844) Lujiaxi
| alt_names = 1966 BZ{{·}}1933 XH
{{mp|1964 VC|1}}{{·}}1975 BW
{{mp|1977 RW|3}}{{·}}1977 SP
{{mp|1980 FY|10}}{{·}}{{mp|1982 VJ|9}}
{{mp|1985 HD|1}}{{·}}1985 JV
1985 KK{{·}}1986 PU
1986 QA{{·}}1987 YQ
| pronounced =
| named_after = Lu Jiaxi {{small|(Chinese chemist)}}
| mp_category = main-belt{{·}}{{small|(middle)}}
Henan
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 83.47 yr (30,488 days)
| aphelion = 3.0148 AU
| perihelion = 2.4484 AU
| semimajor = 2.7316 AU
| eccentricity = 0.1037
| period = 4.51 yr (1,649 days)
| mean_anomaly = 275.75°
| mean_motion = {{Deg2DMS|0.2183|sup=ms}} / day
| inclination = 3.8300°
| asc_node = 137.98°
| arg_peri = 230.28°
| dimensions = {{val|13.74|3.48}} km
{{val|15.538|0.718}} km
25.44 km {{small|(calculated)}}
| rotation = {{val|10.415}} h
{{val|13.33|0.01}} h
| albedo = 0.057 {{small|(assumed)}}
{{val|0.168|0.032}}
{{val|0.18|0.07}}
| spectral_type = SMASS {{=}} L
L {{small|(Bus–DeMeo)}}{{rp|5}}
C {{small|(assumed)}}
| abs_magnitude = 11.60{{·}}11.7{{·}}11.8{{·}}{{val|11.94|0.22}}
}}
3844 Lujiaxi, provisional designation {{mp|1966 BZ}}, is a Henan asteroid from the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 30 January 1966, by astronomers at the Purple Mountain Observatory in Nanjing, China. The asteroid was named after Chinese chemist Lu Jiaxi.
Orbit and classification
Lujiaxi is a member of the Henan family ({{small|532}}), a large asteroid family in the intermediate main-belt, named after 2085 Henan.{{rp|23}} It orbits the Sun in the central asteroid belt at a distance of 2.4–3.0 AU once every 4 years and 6 months (1,649 days; semi-major axis of 2.73 AU). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic.
The body's observation arc begins with its first identification as {{mp|1933 XH}} at Heidelberg Observatory in December 1933, more than 32 years prior to its official discovery observation at Nanjing.
Physical characteristics
In the Bus–DeMeo and SMASS classification, Lujiaxi is an uncommon L-type asteroid,{{rp|5}} which is also the overall spectral type for members of the Henan family.{{rp|23}}
= Rotation period and shape =
In August 2013, a rotational lightcurve of Lujiaxi was obtained from photometric observations by Italian amateur astronomer Silvano Casulli. Lightcurve analysis gave a rotation period of 10.415 hours (given as 0.43397 days) with a brightness amplitude of 0.43 magnitude ({{small|U=n.a.}}).
In December 2014, a study by an international collaboration of astronomers found a period of 13.33 hours with an amplitude of 0.34 magnitude ({{small|U=2+}}). The study selected Lujiaxi because it is a suspected "Barbarian" asteroid with a potentially slow rotation period. This group is named after 234 Barbara, which polarimetric properties and observed occultations suggest that such bodies have an unusual shape and topographic features with large concave areas.
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Lujiaxi measures 13.74 and 15.538 kilometers in diameter and its surface has an albedo of 0.18 and 0.168, respectively.
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 25.44 kilometers based on an absolute magnitude of 11.7.
Naming
This minor planet was named after Lu Jiaxi (1915–2001), a Chinese physical chemist, who headed the Chinese Academy of Sciences and made important contributions to the structural chemistry of cluster compounds. The official naming citation was published by the Minor Planet Center on 11 February 1998 ({{small|M.P.C. 31188}}).
References
{{reflist|30em|refs=
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|title = JPL Small-Body Database Browser: 3844 Lujiaxi (1966 BZ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003844
|publisher = Jet Propulsion Laboratory
|access-date = 18 November 2017}}
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|title = 3844 Lujiaxi (1966 BZ)
|work = Minor Planet Center
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|access-date = 18 November 2017}}
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|title = LCDB Data for (3844) Lujiaxi
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=3844%7CLujiaxi
|access-date = 18 November 2017}}
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}}
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
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|3844}}
- {{JPL small body}}
{{Minor planets navigator |3843 OISCA |number=3844 |3845 Neyachenko }}
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