جنیک ۲۳۲۴

از ویکی‌پدیا، دانشنامهٔ آزاد
(تغییرمسیر از سیارک ۲۳۲۴)
پرش به ناوبری پرش به جستجو
فارسیEnglish
سیارک ۲۳۲۴
اکتشاف
تاریخ کشف نوامبر ۷, ۱۹۷۸
مبدا مه ۱۴, ۲۰۰۸
خروج از مرکز ۰٫۱۷۳۷۹۲۱
آنومالی متوسط ۳۱۰٫۴۶۴۰۸
زاویه انحراف ۰٫۴۰۳۵۱
اوج ۳٫۶۲۷۰۷۲۲
حضیض ۲٫۵۵۳۰۲۰۸
تناوب مداری ۱۹۸۴٫۰۱۹۴۹۴۵

سیارک ۲۳۲۴ (به انگلیسی: 2324 Janice، نامگذاری:1978VS4) دو هزار و سیصد و بیست و چهارمین سیارک کشف شده‌است[۱] که در ۷ نوامبر ۱۹۷۸ کشف شد.[۲]

قدر مطلق سیارک برابر ۱۱٫۳۰ است.[۳]

منابع[ویرایش]

  1. طبق اینجا شماره سیارک معرف شماره کشف شدن آنهاست.
  2. «فهرست سیارک‌های شماره‌دار»، دانشگاه هاروارد بازیابی‌شده در تاریخ ۲۸ سپتامبر ۲۰۰۹
  3. http://starbase.jpl.nasa.gov/msx-a-spirit3-5-sbn0003-mimps-v1.0/as2004_0001/data/simps04/addl.tab

پیوند به بیرون[ویرایش]


2324 Janice
Discovery [1]
Discovered byE. F. Helin
S. J. Bus
Discovery sitePalomar Obs.
Discovery date7 November 1978
Designations
MPC designation(2324) Janice
Named after
Janice Cline [1]
(Supporter at Caltech)
1978 VS4 · 1929 WH
1934 VR · 1949 ME
1961 UP · 1971 OC1
1975 EM2 · 1977 RY4
A911 MC
main-belt[1][2] · (outer)
background[3] · Themis[4][5]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc83.28 yr (30,418 d)
Aphelion3.6382 AU
Perihelion2.5282 AU
3.0832 AU
Eccentricity0.1800
5.41 yr (1,977 d)
245.72°
0° 10m 55.56s / day
Inclination0.3995°
315.66°
305.63°
Physical characteristics
Mean diameter
23.55 km (calculated)[4]
24.33±6.61 km[6]
24.44±1.22 km[7]
25.76±7.43 km[8]
28.463±0.354 km[9]
28.532±0.238 km[10]
28.9±15.91 km[11]
31.19±15.91 km[12]
23.2±0.1 h[11]
0.038±0.004[10]
0.050±0.040[12]
0.06±0.04[6]
0.0601±0.0049[9]
0.07±0.03[8]
0.08 (assumed)[4]
0.093±0.010[7]
C (assumed)[4]
11.30[7] · 11.40[8][9][12]
11.46±0.36[13] · 11.5[2][4]
11.68[6]

2324 Janice, provisional designation 1978 VS4, is a dark background asteroid from the outer regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at the Palomar Observatory in California.[1] The asteroid was named for Janice Cline at Caltech. The presumably C-type asteroid has a rotation period of 23.2 hours.[4]

Orbit and classification

Based on osculating Keplerian orbital elements, Janice is located in the region of the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis.[4]

When applying the hierarchical clustering method to its proper orbital elements, the object is both a non-family asteroid of the main belt's background population (according to Nesvorný),[3] as well as a core member of the Themis family (according to Milani and Knežević).[5]

It orbits the Sun in the outer main-belt at a distance of 2.5–3.6 AU once every 5 years and 5 months (1,977 days; semi-major axis of 3.08 AU). Its orbit has an eccentricity of 0.18 and an inclination of 0° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as A911 MC at Lowell Observatory in June 1911, more than 67 years prior to its official discovery observation at Palomar.[1]

Physical characteristics

Janice is a presumed carbonaceous C-type asteroid which is the overall spectral type of members of the Themis family (602).[4]

Rotation period

In October 2010, a rotational lightcurve of Janice was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota Observatory in Grand Forks (730). Lightcurve analysis gave a tentative rotation period of 23.2 hours with a brightness amplitude of 0.19 magnitude (U=2-).[11] As of 2018, no secure period has been obtained.[4]

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, Janice measures between 24.33 and 31.19 kilometers in diameter and its surface has an albedo between 0.038 and 0.093.[6][7][8][9][10][12]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 23.55 kilometers based on an absolute magnitude of 11.5.[4]

Naming

This minor planet was named after Janice Cline, who for many years has encouraged astrometric studies of minor planets at Caltech.[1] The official naming citation was published by the Minor Planet Center on 1 March 1981 (M.P.C. 5850).[14]

References

  1. ^ a b c d e f "2324 Janice (1978 VS4)". Minor Planet Center. Retrieved 26 March 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 2324 Janice (1978 VS4)" (2018-02-25 last obs.). Jet Propulsion Laboratory. Retrieved 26 March 2018.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 March 2018.
  4. ^ a b c d e f g h i j "LCDB Data for (2324) Janice". Asteroid Lightcurve Database (LCDB). Retrieved 26 March 2018.
  5. ^ a b "Asteroid 2324 Janice – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  6. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 26 March 2018.
  7. ^ a b c d 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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  8. ^ a b c d 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. Retrieved 26 March 2018.
  9. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 March 2018.
  10. ^ a b c 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. Retrieved 26 March 2018.
  11. ^ a b c Gartrelle, Gordon M. (April 2012). "Lightcurve Results for Eleven Asteroids". The Minor Planet Bulletin. 39 (2): 40–46. Bibcode:2012MPBu...39...40G. ISSN 1052-8091. Retrieved 26 March 2018.
  12. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 March 2018.
  13. ^ 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 26 March 2018.
  14. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 March 2018.

External links