4340 Dence

Last updated

4340 Dence
Discovery  [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date4 May 1986
Designations
(4340) Dence
Named after
 Michael R. Dence   [1]
(Canadian geologist)
1986 JZ ·1982 KF4
1986 LN
main-belt   [1] [2]  ·(inner)
background   [3]  · Phocaea   [4]
Orbital characteristics   [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 38.28 yr (13,983 d)
Aphelion 2.9475 AU
Perihelion 1.8408 AU
2.3941 AU
Eccentricity 0.2311
3.70 yr (1,353 d)
212.55°
0° 15m 57.96s / day
Inclination 25.155°
81.012°
175.79°
Physical characteristics
Mean diameter
8.110±0.138  km [5] [6]
8.37 km (calculated) [4]
7.546±0.005  h [7]
7.558±0.0018 h [lower-alpha 1]
7.5668±0.0018 h [lower-alpha 1]
15.473±0.005 h(poor) [8]
0.155±0.028 [5] [6]
0.23(assumed) [4]
SMASS = S   [2] [4]
12.6 [2] [4]
12.67±1.14 [9]
13.1 [6]

    4340 Dence, provisional designation 1986 JZ, is a background or Phocaea asteroid from the inner regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 4 May 1986, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. [1] The S-type asteroid has a rotation period of 7.5 hours. [4] It was named after Canadian geologist Michael R. Dence. [1]

    Contents

    Orbit and classification

    Dence is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [3] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the stony Phocaea family ( 701 ). [4] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.9  AU once every 3 years and 8 months (1,353 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.23 and an inclination of 25° with respect to the ecliptic. [2] The body's observation arc begins with a precovery taken at the Siding Spring Observatory in November 1979, more than six years prior to its official discovery observation at Palomar. [1]

    Physical characteristics

    In the SMASS classification, Dence is a common, stony S-type asteroid. [2] [4]

    Rotation period

    Since 2008, several rotational lightcurves of Dence have been obtained from photometric observations by Czech astronomer Petr Pravec and by Maurice Clark at the observatory of the Montgomery College in Maryland, United States ( U=3-/1/2/2 ). [7] [8] [lower-alpha 1] Analysis of the best-rated lightcurve gave a rotation period of 7.546 hours with a brightness amplitude of 0.58 magnitude ( U=3- ). [4] [7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Dence measures 8.110 kilometers in diameter and its surface has an albedo of 0.155, [5] [6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 – derived from 25 Phocaea, the parent body of the Phocaea family – and calculates a diameter of 8.37 kilometers based on an absolute magnitude of 12.6. [4]

    Naming

    This minor planet was named after Canadian geologist Michael R. Dence executive director of the Royal Society of Canada. He was a pioneer in the geologic investigation of ancient impact craters on the Canadian Shield (also see Sudbury Basin and Manicouagan Reservoir). [1] The official naming citation was published by the Minor Planet Center on 30 January 1991 ( M.P.C. 17656). [10]

    Notes

    1. 1 2 3 Lightcurve plot (April 2008) and follow-up plot (May 2008) of (4340) Dence by Petr Pravec. Rotation period of 7.558±0.0018 and 7.5668±0.0018 hours and a brightness amplitude of 0.07±0.01 and 0.11±0.01 magnitude. Quality code of 2/2. Summary figures at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2008) Plots from Ondrejov data, obtained by the NEO Photometric Program and collaborating projects.

    Related Research Articles

    <span class="mw-page-title-main">2830 Greenwich</span> Asteroid

    2830 Greenwich is a bright Phocaea asteroid from the inner regions of the asteroid belt. It was discovered on 14 April 1980, by American astronomer Edward Bowell at Lowell's U.S. Anderson Mesa Station, Arizona, and named for the historical Royal Greenwich Observatory in England. The stony S-type asteroid has a long rotation period of 24 hours and measures approximately 9 kilometers in diameter

    6398 Timhunter, provisional designation 1991 CD1, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 10 February 1991, by American astronomer couple Carolyn and Eugene Shoemaker, in collaboration with Canadian astronomer David H. Levy at Palomar Observatory in California, United States. It was named for American amateur astronomer Tim Hunter.

    4899 Candace, provisional designation 1988 JU, is a background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 9 May 1988, by astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States. The asteroid was named after American chemist Candace Kohl.

    19982 Barbaradoore, provisional designation 1990 BJ, is an eccentric, stony Phocaea asteroid and a recent Mars-crosser from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 22 January 1990, by American astronomer Eleanor Helin at the Palomar Observatory in California, United States. The asteroid was named after Barbara Doore, a cousin of the discoverer.

    6084 Bascom, provisional designation 1985 CT, is a binary Phocaea asteroid from the inner regions of the asteroid belt, approximately 6.3 kilometers in diameter. It was discovered on 12 February 1985, by American astronomer couple Carolyn and Eugene Shoemaker at Palomar Observatory in California. It is named after American geologist Florence Bascom. Its satellite measures approximately 2.3 kilometers and has an orbital period of 43.51 hours.

    29292 Conniewalker, provisional designation 1993 KZ1, is a bright, stony Phocaea asteroid and slow tumbler from the inner regions of the asteroid belt, approximately 4.6 kilometers in diameter. It was discovered on 24 May 1993, by American astronomer Carolyn Shoemaker and Canadian astronomer David Levy at the Palomar Observatory in California, United States.

    4008 Corbin, provisional designation 1977 BY, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 22 January 1977, by staff members of the Felix Aguilar Observatory's at the Leoncito Astronomical Complex in Argentina.

    19763 Klimesh, provisional designation 2000 MC, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by NEAT at Haleakala Observatory in 2000, the asteroid was named for NEAT's software specialist Matthew Klimesh.

    2696 Magion, provisional designation 1980 HB, is a dark background asteroid and a slow rotator from the inner regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 16 April 1980, by Slovak astronomer Ladislav Brožek at the Kleť Observatory in former Czechoslovakia. The X-type asteroid has an ambiguous rotation period of 480 hours and is possibly a tumbler. It was named for the first Czechoslovak satellite, Magion 1, launched in 1978.

    15350 Naganuma, provisional designation 1994 VB2, is a stony background asteroid from the inner regions of the asteroid belt, approximately 4.3 kilometers (2.7 miles) in diameter. It was discovered on 3 November 1994, by Japanese astronomers Yoshio Kushida and Osamu Muramatsu at the Yatsugatake South Base Observatory. The likely S-type asteroid has a rotation period of 2.5 hours. It was named for the town of Naganuma in northern Japan.

    1979 Sakharov, provisionally designated 2006 P-L, is a stony Vestian asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered during the Palomar–Leiden survey in 1960, and named after Russian physicist Andrei Sakharov.

    1405 Sibelius, provisional designation 1936 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 12 September 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after composer Jean Sibelius.

    23712 Willpatrick, provisional designation 1998 AA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter.

    4760 Jia-xiang, provisional designation 1981 GN1, is a background asteroid from the inner regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 1 April 1981, by astronomers at Harvard University's Oak Ridge Observatory in Massachusetts, United States. The presumed stony S-type asteroid was named after Chinese astronomer Zhang Jiaxiang. It has a rotation period of 14.96 hours.

    1530 Rantaseppä, provisional designation 1938 SG, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. Discovered by Yrjö Väisälä at Turku Observatory in 1938, it was later named after Finnish astronomer Hilkka Rantaseppä-Helenius.

    2195 Tengström, provisional designation 1941 SP1, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 27 September 1941, by Finnish astronomer Liisi Oterma at Turku Observatory in Southwest Finland, and named for Swedish geodesist Erik Tengström.

    1573 Väisälä, provisional designation 1949 UA, is a stony Phocaea asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 27 October 1949, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, Belgium. It was named for Finnish astronomer Yrjö Väisälä.

    6181 Bobweber, provisional designation 1986 RW, is a stony asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 6 September 1986, by American astronomer Eleanor Helin at the U.S. Palomar Observatory in California, and named after astronomer Robert Weber.

    3982 Kastelʹ, provisional designation 1984 JP1, is a Florian asteroid and a suspected binary system from the inner regions of the asteroid belt, approximately 6.9 kilometers in diameter.

    10208 Germanicus, provisional designation 1997 QN1, is a stony Florian asteroid and binary system from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter.

    References

    1. 1 2 3 4 5 6 7 "4340 Dence (1986 JZ)". Minor Planet Center. Retrieved 3 May 2018.
    2. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 4340 Dence (1986 JZ)" (2018-02-27 last obs.). Jet Propulsion Laboratory . Retrieved 3 May 2018.
    3. 1 2 "Asteroid 4340 Dence – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    4. 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (4340) Dence". Asteroid Lightcurve Database (LCDB). Retrieved 3 May 2018.
    5. 1 2 3 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. S2CID   118745497.
    6. 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. S2CID   35447010. (catalog)
    7. 1 2 3 Clark, Maurice (July 2015). "Asteroid Photometry from the Preston Gott Observatory". The Minor Planet Bulletin. 42 (3): 163–166. Bibcode:2015MPBu...42..163C. ISSN   1052-8091.
    8. 1 2 Clark, Maurice (October 2008). "Asteroid Lightcurve Observations". The Minor Planet Bulletin. 35 (4): 152–154. Bibcode:2008MPBu...35..152C. 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. S2CID   53493339.
    10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 May 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.