4085 Weir

Last updated
4085 Weir
Discovery  [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date13 May 1985
Designations
(4085) Weir
Named after
Doris Blackman Weir  [2] [3]
(American geologist)
1985 JR ·1981 JY
1982 XK
main-belt  ·(middle)  [4]
Eunomia   [5]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 36.57 yr (13,356 days)
Aphelion 2.8838 AU
Perihelion 2.3288 AU
2.6063 AU
Eccentricity 0.1065
4.21 yr (1,537 days)
261.69°
0° 14m 3.12s / day
Inclination 14.220°
68.681°
136.29°
Physical characteristics
Dimensions9.221±0.241 km [6]
9.579±0.048 km [7]
9.66±0.77 km [8]
11.30 km (calculated) [4]
14.602±0.005 h [9] [lower-alpha 1]
14.657±0.0046 h [10]
0.20 (assumed) [4]
0.228±0.038 [8]
0.2334±0.0274 [7]
0.273±0.060 [6]
S (Tholen) [4]
12.025±0.001(R) [10]  ·12.1 [1] [4]  ·12.30 [7] [8]  ·12.38±0.22 [11]

    4085 Weir, provisional designation 1985 JR, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 13 May 1985, by astronomer Carolyn Shoemaker at the Palomar Observatory in California, United States. The asteroid was named after American geologist Doris Blackman Weir. [2] [3]

    Contents

    Orbit and classification

    Weir is a member of the Eunomia family ( 502 ), [5] a prominent family of stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members. [12] : 23  It orbits the Sun in the central main-belt at a distance of 2.3–2.9  AU once every 4 years and 3 months (1,537 days; semi-major axis of 2.61 AU). Its orbit has an eccentricity of 0.11 and an inclination of 14° with respect to the ecliptic. [1]

    The body's observation arc begins with its first observation as 1981 JY at Anderson Mesa Station in May 1981, or four years prior to its official discovery observation at Palomar. [2]

    Physical characteristics

    In the Tholen classification, Weir is a common, stony S-type asteroid, [4] which is also the overall spectral type for members of the Eunomia family. [12] : 23 

    Rotation period

    In May 2006, a rotational lightcurve of Weir was obtained from photometric observations by Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 14.602 hours with a brightness variation of 0.18 magnitude ( U=2 ). [9] [lower-alpha 1] A concurring period of 14.657 hours and an amplitude of 0.24 magnitude was measured by astronomers at the Palomar Transient Factory in May 2010 ( U=2 ). [10]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Weir measures between 9.221 and 9.66 kilometers in diameter and its surface has an albedo between 0.228 and 0.273. [6] [7] [8]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.30 kilometers based on an absolute magnitude of 12.1. [4]

    Naming

    This minor planet was named after American planetary geologist with the United States Geological Survey, Doris Blackman Weir. [2] [3] The approved naming citation was published by the Minor Planet Center on 12 December 1989 ( M.P.C. 15576). [13]

    Notes

    1. 1 2 Lightcurve plot of 4085 Weir, Palmer Divide Observatory, B. D. Warner (2006). Rotation period 14.602±0.005 hours with a brightness amplitude of 0.18±0.02 mag. Summary figures at the LCDB

    Related Research Articles

    1982 Cline, provisional designation 1975 VA, is a stony asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 4 November 1975, by American astronomer Eleanor Helin at Palomar Observatory in California, and named after Edwin Lee Cline, inventor and friend of the discoverer.

    1179 Mally, provisional designation 1931 FD, is an asteroid and long-lost minor planet from the central region of the asteroid belt, approximately 13 kilometers in diameter. Discovered by Max Wolf in 1931, the asteroid was lost until its rediscovery in 1986. The discoverer named it after his daughter-in-law, Mally Wolf.

    <span class="mw-page-title-main">1050 Meta</span> Stony, main-belt asteroid of the Eunomia family

    1050 Meta, provisional designation 1925 RC, is a stony Eunomia asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 14 September 1925, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The meaning of the asteroids's name is unknown. The presumably S-type asteroid has a rotation period of 6.14 hours and possibly an elongated shape.

    1142 Aetolia, provisional designation 1930 BC, is a stony background asteroid from the outer region of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 24 January 1930, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory and named for the Greek region Aetolia.

    2531 Cambridge, provisional designation 1980 LD, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 11 June 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The asteroid was named for the Cambridge University.

    <span class="mw-page-title-main">1286 Banachiewicza</span> Asteroid

    1286 Banachiewicza is an elongated Eos asteroid from the outer regions of the asteroid belt. It was discovered on 25 August 1933, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle. The stony S-type asteroid has a rotation period of 8.6 hours and measures approximately 21 kilometers in diameter. It was named after Polish astronomer Tadeusz Banachiewicz.

    <span class="mw-page-title-main">1275 Cimbria</span>

    1275 Cimbria is a Eunomia asteroid from the central regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 30 November 1932, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southern Germany. The asteroid was named after the Cimbri, an ancient Germanic tribe.

    <span class="mw-page-title-main">1274 Delportia</span>

    1274 Delportia, provisional designation 1932 WC, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 28 November 1932, by Belgian astronomer Eugène Delporte at Uccle Observatory in Belgium. It was named after the discoverer himself.

    1806 Derice, provisional designation 1971 LC, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered on 13 June 1971, at the Bickley site of the Perth Observatory in Western Australia, it was the first discovery of a minor planet ever made in Oceania. The asteroid was named after the wife of Dennis Harwood, staff member at Bickley.

    3700 Geowilliams, provisional designation 1984 UL2, is a stony background asteroid from the inner regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 23 October 1984, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States. The S k-subtype has a rotation period of 14.38 hours. It was named for Australian geologist George E. Williams.

    2187 La Silla, provisionally designated 1976 UH, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 12 kilometers in diameter.

    3066 McFadden, provisional designation 1984 EO, is a stony background asteroid from the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 1 March 1984, by American astronomer Edward Bowell at the Anderson Mesa Station near Tucson, Arizona. It was named for American planetary scientist Lucy-Ann McFadden. The assumed S-type asteroid has a rotation period of 13.8 hours.

    <span class="mw-page-title-main">1837 Osita</span>

    1837 Osita (prov. designation: 1971 QZ1) is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 August 1971, by American astronomer James Gibson at the Yale–Columbia Southern Station of the Leoncito Astronomical Complex in Argentina, who named it after his wife Ursula ("Osita").

    2122 Pyatiletka, provisional designation 1971 XB, is a stony asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter.

    1737 Severny, provisional designation 1966 TJ, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 21 kilometers in diameter.

    2554 Skiff, provisional designation 1980 OB, is a Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 17 July 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona. The presumed S-type asteroid has a rotation period of 25.6 hours and was named after astronomer Brian Skiff.

    2433 Sootiyo, provisional designation 1981 GJ, is a stony asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 5 April 1981, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona. The asteroid was named "Sootiya" meaning "star boy" in the Hopi language.

    <span class="mw-page-title-main">2111 Tselina</span> Stony asteroid in the outer asteroid belt

    2111 Tselina is a stony Eos asteroid from the outer regions of the asteroid belt. It was discovered on 13 June 1969, by Soviet astronomer Tamara Smirnova at Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The S-type asteroid has a rotation period of 6.6 hours and measures approximately 23 kilometers in diameter. It was later named after the Soviet Virgin Lands Campaign.

    1259 Ógyalla, provisional designation 1933 BT, is a Themistian asteroid from the outer region of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 29 January 1933, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named for the Hurbanovo Observatory.

    <span class="mw-page-title-main">5357 Sekiguchi</span> Asteroid

    5357 Sekiguchi is an Eos asteroid from the outer region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 2 March 1992, by Japanese amateur astronomers Tetsuya Fujii and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan. The asteroid was later named after Japanese astronomer Tomohiko Sekiguch.

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 4085 Weir (1985 JR)" (2017-11-28 last obs.). Jet Propulsion Laboratory. Retrieved 8 January 2018.
    2. 1 2 3 4 "4085 Weir (1985 JR)". Minor Planet Center. Retrieved 8 January 2018.
    3. 1 2 3 Schmadel, Lutz D. (2007). "(4085) Weir". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 349. doi:10.1007/978-3-540-29925-7_4063. ISBN   978-3-540-00238-3.
    4. 1 2 3 4 5 6 7 "LCDB Data for (4085) Weir". Asteroid Lightcurve Database (LCDB). Retrieved 8 January 2018.
    5. 1 2 "Asteroid 4085 Weir – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    6. 1 2 3 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv: 1406.6645 . Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    7. 1 2 3 4 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.
    8. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117.
    9. 1 2 Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006". The Minor Planet Bulletin. 33 (4): 85–88. Bibcode:2006MPBu...33...85W. ISSN   1052-8091 . Retrieved 8 January 2018.
    10. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv: 1504.04041 . Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75 . Retrieved 8 January 2018.
    11. ↑ 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 . Retrieved 8 January 2018.
    12. 1 2 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv: 1502.01628 . Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN   9780816532131.
    13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 8 January 2018.

    This page is based on this Wikipedia article
    Text is available under the CC BY-SA 4.0 license; additional terms may apply.
    Images, videos and audio are available under their respective licenses.