1131 Porzia

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1131 Porzia
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date10 September 1929
Designations
(1131) Porzia
PronunciationGerman: [ˈpɔʁtsi̯aː]
Named after
 Porcia Catonis
(in Shakespeare's play)
Julius Caesar [2]
1929 RO ·1939 TJ
1962 MB
Mars-crosser [1] [3] [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 87.55 yr (31,978 days)
Aphelion 2.8667 AU
Perihelion 1.5893 AU
2.2280 AU
Eccentricity 0.2867
3.33 yr (1,215 days)
165.22°
0° 17m 47.04s / day
Inclination 3.2292°
100.71°
248.01°
Physical characteristics
Dimensions6.53±0.65 km [5]
7.13 km (calculated) [4]
4.0±0.2 h (dated) [6]
4.6584±0.0005 h [7]
4.6601±0.0006 h [8]
0.20 (assumed) [4]
0.287±0.057 [5]
SMASS = S [1]  · S [4] [9]
11.94±0.70 [10]  ·12.00 [9]  ·12.90 [5]  ·13.0 [1]  ·13.10±0.14 [4] [6] [11]

    1131 Porzia, provisional designation 1929 RO, is a stony asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 10 September 1929, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. [3] The asteroid was named after Porcia wife of Brutus, who assassinated Julius Caesar. [2]

    Contents

    Orbit and classification

    Porzia is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666  AU. It orbits the Sun at a distance of 1.6–2.9  AU once every 3 years and 4 months (1,215 days). Its orbit has an eccentricity of 0.29 and an inclination of 3° with respect to the ecliptic. [1] The body's observation arc begins at Heidelberg, 19 days after its official discovery observation. [3]

    Physical characteristics

    In the SMASS taxonomy, Porzia is a common stony S-type asteroid. [1]

    Lightcurves

    Two rotational lightcurves of Porzia were obtained by Vladimir Benishek at Belgrade Observatory shortly before its opposition in November 2009, and by French amateur astronomer René Roy in December 2012. Lightcurve analysis gave a well defined rotation period of 4.6584 and 4.6601 hours with a brightness variation of 0.15 and 0.19 magnitude, respectively ( U=3/3 ). [7] [8]

    The results supersede photometric observations taken by Polish astronomer Wiesław Wiśniewski in January 1990, which rendered a lightcurve with a period 4.0±0.2 hours and an amplitude of 0.23 magnitude ( U=2 ). [6]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, Porzia measures 6.53 kilometers in diameter and its surface has an albedo of 0.287, [5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.13 kilometers with an absolute magnitude of 13.10. [4]

    This makes Porzia one of the larger mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (8.73 km), 1011 Laodamia (7.5 km), 1727 Mette (est. 9 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km), 1310 Villigera (15.24 km) and 1468 Zomba (7 km), but far smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter.

    Naming

    This minor planet was named after the wife of Brutus, Porcia Catonis, who kills herself at news of her husband's death in Shakespeare's play Julius Caesar . [2] The official naming citation was also published by Paul Herget in The Names of the Minor Planets in 1955 ( H 106 ). [2]

    Related Research Articles

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    <span class="mw-page-title-main">512 Taurinensis</span> Mars-crossing asteroid

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    3581 Alvarez, provisional designation 1985 HC, is a carbonaceous asteroid and a very large Mars-crosser on an eccentric orbit from the asteroid belt, approximately 13.7 kilometers in diameter. It was discovered on 23 April 1985, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The likely spherical B-type asteroid has a rotation period of 33.4 hours. It was named for scientists Luis Alvarez and his son Walter Alvarez.

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    3737 Beckman, provisional designation 1983 PA, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 8 August 1983, by American astronomer Eleanor Helin at the Palomar Observatory in California. The S-type asteroid has a rotation period of 3.1 hours. It was named for American Chemist Arnold Beckman.

    1474 Beira, provisional designation 1935 QY, is a bright carbonaceous asteroid and large Mars-crosser on an eccentric orbit from the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 20 August 1935, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was named after the port city of Beira in Mozambique.

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    2744 Birgitta, provisional designation 1975 RB, is a stony asteroid and a Mars-crosser on an eccentric orbit from the innermost regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered at the Kvistaberg Station of the Uppsala Observatory in Sweden on 4 September 1975, by Swedish astronomer Claes-Ingvar Lagerkvist, who named it after his daughter, Anna Birgitta Angelica Lagerkvist. The S-type asteroid has a rotation period of 9.0 hours.

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    1316 Kasan, provisional designation 1933 WC, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 17 November 1933, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the city of Kazan, Russia, and its nearby Engelhardt Observatory.

    6170 Levasseur, provisional designation 1981 GP, is a stony Phocaean asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 5.7 kilometers in diameter. It was discovered on 5 April 1981, by American astronomer Edward Bowell at the Anderson Mesa Station in Arizona. The S-type asteroid has a short rotation period of 2.65 hours. It was named for French planetary scientist Anny-Chantal Levasseur-Regourd.

    3343 Nedzel, provisional designation 1982 HS, is an asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 28 April 1982, by astronomer Laurence Taff at the Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, in the United States. The asteroid was named in memory of Alexander Nedzel, a manager at MIT Lincoln Laboratory.

    3198 Wallonia, provisional designation 1981 YH1, is a stony asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 7.1 kilometers (4.4 miles) in diameter. It was discovered on 30 December 1981, by Belgian astronomer François Dossin at the Haute-Provence Observatory in France. The S/K-type asteroid has a rotation period of 7.5 hours. It was named after the French speaking region of Wallonia in Belgium.

    1468 Zomba, provisional designation 1938 PA, is a stony asteroid and large Mars-crosser near the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by Cyril Jackson at Johannesburg Observatory in 1938, the asteroid was named after the city of Zomba in the Republic of Malawi.

    <span class="mw-page-title-main">1310 Villigera</span>

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    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 1131 Porzia (1929 RO)" (2017-03-30 last obs.). Jet Propulsion Laboratory . Retrieved 26 July 2017.
    2. 1 2 3 4 Schmadel, Lutz D. (2007). "(1131) Porzia". Dictionary of Minor Planet Names – (1131) Porzia. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1132. ISBN   978-3-540-00238-3.
    3. 1 2 3 "1131 Porzia (1929 RO)". Minor Planet Center. Retrieved 8 February 2017.
    4. 1 2 3 4 5 6 "LCDB Data for (1131) Porzia". Asteroid Lightcurve Database (LCDB). Retrieved 8 February 2017.
    5. 1 2 3 4 Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data" (PDF). Astronomy and Astrophysics. 603: 8. arXiv: 1705.10263 . Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917 . Retrieved 20 October 2017.
    6. 1 2 3 Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W . Retrieved 8 February 2017.
    7. 1 2 Benishek, Vladimir; Protitch-Benishek, Vojislava (April 2010). "Period Determination for 1131 Porzia and 1819 Laputa". The Minor Planet Bulletin. 37 (2): 64–65. Bibcode:2010MPBu...37...64B. ISSN   1052-8091 . Retrieved 8 February 2017.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1131) Porzia". Geneva Observatory . Retrieved 8 February 2017.
    9. 1 2 Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv: 1601.02087 . Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047 . Retrieved 8 February 2017.
    10. ↑ 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 February 2017.
    11. ↑ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026 . Retrieved 8 February 2017.
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