astro.wikisort.org - Asteroid

1332 Marconia, provisional designation 1934 AA, is a dark asteroid and the parent body of the Marconia family located in the outer regions of the asteroid belt. It measures approximately 46 kilometers (29 miles) in diameter. The asteroid was discovered on 9 January 1934, by Italian astronomer Luigi Volta at the Observatory of Turin in Pino Torinese, northern Italy.[1] It was named for Italian electrical engineer Guglielmo Marconi.[2] The uncommon L-type asteroid has a rotation period of 19.2 hours.[4]

1332 Marconia

Modelled shape of Marconia from its lightcurve
Discovery[1]
Discovered by	L. Volta
Discovery site	Pino Torinese Obs.
Discovery date	9 January 1934
Designations
MPC designation	(1332) Marconia
Named after	Guglielmo Marconi[2] (Italian engineer)
Alternative designations	1934 AA · 1930 HQ 1932 VC · 1935 FR 1948 SH · 1956 GB A905 UD · A921 TE A921 UD · A924 EH
Minor planet category	main-belt[1][3] · (outer)[4] Marconia[5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	112.02 yr (40,916 d)
Aphelion	3.4664 AU
Perihelion	2.6587 AU
Semi-major axis	3.0626 AU
Eccentricity	0.1319
Orbital period (sidereal)	5.36 yr (1,958 d)
Mean anomaly	2.3975°
Mean motion	0° 11m 2.04s / day
Inclination	2.4568°
Longitude of ascending node	13.652°
Argument of perihelion	348.94°
Physical characteristics
Mean diameter	43.90 km (derived)[4] 44.93±10.33 km[6] 46.03±15.75 km[7] 46.796±0.141 km[8] 49.95±0.61 km[9] 52.009±0.600 km[10]
Synodic rotation period	19.16±0.01 h[11] 19.2264±0.0001 h[12] 32.1201±0.0005 h[13]
Geometric albedo	0.04±0.02[6] 0.04±0.04[7] 0.0527 (derived)[4] 0.0543±0.0105[10] 0.060±0.002[9] 0.063±0.008[8]
Spectral type	SMASS = Ld[3][13] L (Bus–DeMeo)[13]
Absolute magnitude (H)	10.20[9][10] · 10.50[7] 10.6[3][4] · 10.62[6]

Orbit and classification

Marconia is the parent body of the Marconia family (636),[5] a tiny asteroid family of less than 50 known members.[14] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.5 AU once every 5 years and 4 months (1,958 days; semi-major axis of 3.06 AU). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic.[3]

The asteroid was first observed in October 1905, as A905 UD at Heidelberg Observatory, where the body's observation arc begins as A924 EH in March 1924, almost 10 years prior to its official discovery observation at Pino Torinese.[1]

Physical characteristics

Marconia has been characterized as an L-type asteroid in the Bus–DeMeo taxonomic system, while in the SMASS classification, it is an Ld-subtype that transitions between the L-type and D-type asteroids.[3][13] The overall spectral type for members of the Marconia family is that of a carbonaceous C-type and X-type.[14]^: 23

Rotation period and poles

In September 2012, a first rotational lightcurve of Marconia was obtained from photometric observations by Robert Stephens at his Santana Observatory (646) in California. Lightcurve analysis gave a well-defined rotation period of 19.16 hours with a brightness variation of 0.30 magnitude (U=3).[11]

A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database, gave a concurring sidereal period of 19.2264 hours, as well as a spin axes of (37.0°, 31.0°) and (220.0°, 31.0°) in ecliptic coordinates (λ, β).[12] Conversely, another lightcurve inversion study by an international collaboration gave a longer spin rate of 32.1201 hours.[13]

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, Marconia measures between 44.93 and 52.009 kilometers in diameter and its surface has an albedo between 0.04 and 0.063.[6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0527 and a diameter of 43.90 kilometers based on an absolute magnitude of 10.6.[4]

Naming

This minor planet was named after Guglielmo Marconi (1874–1937), an Italian electrical engineer, pioneer and inventor of radio. In 1909, he received the Nobel Prize in Physics together with Karl Ferdinand Braun (also see List of Nobel laureates in Physics § Laureates). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 121). The lunar crater Marconi was also named in his honor.[2]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1332 Marconia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1332 Marconia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

---

[de] (1332) Marconia

(1332) Marconia ist ein Asteroid des Hauptgürtels, der am 9. Januar 1934 vom italienischen Astronomen Luigi Volta in Pino Torinese entdeckt wurde.

---

- [en] 1332 Marconia

---

---