From Wikipedia, the free encyclopedia

127 Johanna
A three-dimensional model of 127 Johanna based on its light curve
Discovery
Discovered by Paul Henry and Prosper Henry
Discovery date5 November 1872
Designations
(127) Johanna
Pronunciation /ˈhænə/ [1]
Named after
Joan of Arc
A872 VB
Main belt
Orbital characteristics [2]
Epoch 31 July 2016 ( JD 2457600.5)
Uncertainty parameter 0
Observation arc98.53 yr (35989 d)
Aphelion2.94  AU (439.95  Gm)
Perihelion2.57 AU (384.67 Gm)
2.76 AU (412.31 Gm)
Eccentricity0.067041
4.58 yr (1,671.3 d)
17.92 km/s
67.782 °
0° 12m 55.44s / day
Inclination8.2449°
31.154°
94.611°
Earth  MOID1.60 AU (239.57 Gm)
Jupiter  MOID2.11 AU (315.95 Gm)
TJupiter3.325
Physical characteristics
Dimensions122 [2]
116.14±3.93 km [3]
Mass(3.08 ± 1.35) × 1018 kg [3]
Mean density
3.75±1.68 g/cm3 [3]
12.7988  h (0.53328  d) [2] [4]
0.0557±0.0039 [5]
Temperature~168 K
CX [6] ( Tholen)
Ch [6] ( Bus)
8.6, [2] 8.30 [5]

Johanna ( minor planet designation: 127 Johanna) is a large, dark main-belt asteroid that was discovered by French astronomers Paul Henry and Prosper Henry on 5 November 1872, and is believed to be named after Joan of Arc. [7] It is classified as a CX-type asteroid, indicating the spectrum shows properties of both a carbonaceous C-type asteroid and a metallic X-type asteroid. [6]

A photoelectric study was performed of this minor planet in 1991 at the Konkoly Observatory in Hungary. The resulting light curve showed a synodic rotation period of 6.94 ± 0.29 hours with a brightness variation of 0.2 in magnitude. It was estimated to have an absolute magnitude of 8.459 ± 0.013 with a diameter of 96–118 km (60–73 mi) and an albedo of 0.06–0.04. [8]

Infrared observations made in 1982 at Konkoly showed a rapid variation that seemed to suggest a shorter rotation period of 1.5 hours; one of the fastest known at the time. However, an irregular shape was suggested as an alternative cause of the rapid variation. [9] The present day established rotation period of this object is 12.7988 hours. [4]

During 2001, 127 Johanna was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 117 ± 21 km. [6] A larger diameter value of 123.41 ± 4.07 km was obtained from the Midcourse Space Experiment observations, with an albedo of 0.0557 ± 0.0039. [5] A 2012 study gave a refined diameter estimate of 116.14 ± 3.93 km. [3]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d Yeomans, Donald K., "127 Johanna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  3. ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv: 1203.4336, Bibcode: 2012P&SS...73...98C, doi: 10.1016/j.pss.2012.03.009. See Table 1.
  4. ^ a b Behrend, Raoul, Courbes de rotation d'astéroïdes et de comètes (in French), Observatoire de Genève, retrieved 29 March 2013
  5. ^ a b c Tedesco, Edward F.; et al. (July 2002), "The Midcourse Space Experiment Infrared Minor Planet Survey", The Astronomical Journal, vol. 124, no. 124, pp. 583–591, Bibcode: 2002AJ....124..583T, doi: 10.1086/340960.
  6. ^ a b c d Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus, 186 (1): 126–151, Bibcode: 2007Icar..186..126M, doi: 10.1016/j.icarus.2006.08.018
  7. ^ Schmadel, Lutz D.; International Astronomical Union (2003), Dictionary of minor planet names, Berlin; New York: Springer-Verlag, p. 27, ISBN  978-3-540-00238-3.
  8. ^ Toth, Imre (December 1997), "First lightcurve observations and rotation of minor planet 127 Johanna", Planetary and Space Science, vol. 45, pp. 1625–1637, Bibcode: 1997P&SS...45.1625T, doi: 10.1016/S0032-0633(97)00141-4.
  9. ^ Szecsenyi-Nagy, G. (1983), "127 Johanna - Is it really the most quickly spinning asteroid known at this moment?", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, June 20–22, 1983, vol. 45, pp. 49–53, Bibcode: 1983acm..proc...49S, doi: 10.1016/S0032-0633(97)00141-4.
From Wikipedia, the free encyclopedia

127 Johanna
A three-dimensional model of 127 Johanna based on its light curve
Discovery
Discovered by Paul Henry and Prosper Henry
Discovery date5 November 1872
Designations
(127) Johanna
Pronunciation /ˈhænə/ [1]
Named after
Joan of Arc
A872 VB
Main belt
Orbital characteristics [2]
Epoch 31 July 2016 ( JD 2457600.5)
Uncertainty parameter 0
Observation arc98.53 yr (35989 d)
Aphelion2.94  AU (439.95  Gm)
Perihelion2.57 AU (384.67 Gm)
2.76 AU (412.31 Gm)
Eccentricity0.067041
4.58 yr (1,671.3 d)
17.92 km/s
67.782 °
0° 12m 55.44s / day
Inclination8.2449°
31.154°
94.611°
Earth  MOID1.60 AU (239.57 Gm)
Jupiter  MOID2.11 AU (315.95 Gm)
TJupiter3.325
Physical characteristics
Dimensions122 [2]
116.14±3.93 km [3]
Mass(3.08 ± 1.35) × 1018 kg [3]
Mean density
3.75±1.68 g/cm3 [3]
12.7988  h (0.53328  d) [2] [4]
0.0557±0.0039 [5]
Temperature~168 K
CX [6] ( Tholen)
Ch [6] ( Bus)
8.6, [2] 8.30 [5]

Johanna ( minor planet designation: 127 Johanna) is a large, dark main-belt asteroid that was discovered by French astronomers Paul Henry and Prosper Henry on 5 November 1872, and is believed to be named after Joan of Arc. [7] It is classified as a CX-type asteroid, indicating the spectrum shows properties of both a carbonaceous C-type asteroid and a metallic X-type asteroid. [6]

A photoelectric study was performed of this minor planet in 1991 at the Konkoly Observatory in Hungary. The resulting light curve showed a synodic rotation period of 6.94 ± 0.29 hours with a brightness variation of 0.2 in magnitude. It was estimated to have an absolute magnitude of 8.459 ± 0.013 with a diameter of 96–118 km (60–73 mi) and an albedo of 0.06–0.04. [8]

Infrared observations made in 1982 at Konkoly showed a rapid variation that seemed to suggest a shorter rotation period of 1.5 hours; one of the fastest known at the time. However, an irregular shape was suggested as an alternative cause of the rapid variation. [9] The present day established rotation period of this object is 12.7988 hours. [4]

During 2001, 127 Johanna was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 117 ± 21 km. [6] A larger diameter value of 123.41 ± 4.07 km was obtained from the Midcourse Space Experiment observations, with an albedo of 0.0557 ± 0.0039. [5] A 2012 study gave a refined diameter estimate of 116.14 ± 3.93 km. [3]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d Yeomans, Donald K., "127 Johanna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  3. ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv: 1203.4336, Bibcode: 2012P&SS...73...98C, doi: 10.1016/j.pss.2012.03.009. See Table 1.
  4. ^ a b Behrend, Raoul, Courbes de rotation d'astéroïdes et de comètes (in French), Observatoire de Genève, retrieved 29 March 2013
  5. ^ a b c Tedesco, Edward F.; et al. (July 2002), "The Midcourse Space Experiment Infrared Minor Planet Survey", The Astronomical Journal, vol. 124, no. 124, pp. 583–591, Bibcode: 2002AJ....124..583T, doi: 10.1086/340960.
  6. ^ a b c d Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus, 186 (1): 126–151, Bibcode: 2007Icar..186..126M, doi: 10.1016/j.icarus.2006.08.018
  7. ^ Schmadel, Lutz D.; International Astronomical Union (2003), Dictionary of minor planet names, Berlin; New York: Springer-Verlag, p. 27, ISBN  978-3-540-00238-3.
  8. ^ Toth, Imre (December 1997), "First lightcurve observations and rotation of minor planet 127 Johanna", Planetary and Space Science, vol. 45, pp. 1625–1637, Bibcode: 1997P&SS...45.1625T, doi: 10.1016/S0032-0633(97)00141-4.
  9. ^ Szecsenyi-Nagy, G. (1983), "127 Johanna - Is it really the most quickly spinning asteroid known at this moment?", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, June 20–22, 1983, vol. 45, pp. 49–53, Bibcode: 1983acm..proc...49S, doi: 10.1016/S0032-0633(97)00141-4.

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