astro.wikisort.org - Asteroid

889 Erynia /ɛˈraɪniə/ is a highly elongated background asteroid from the inner regions of the asteroid belt. It was discovered on 5 March 1918, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory, and given the provisional designations A918 EN and 1918 DG.[1] The stony S-type asteroid (Sl) has a rotation period of 9.89 hours and measures approximately 17 kilometers (11 miles) in diameter. It was named from Greek mythology, after the Erinyes, also known as Furies.[2]

889 Erynia

Modelled shape of Erynia from its lightcurve
Discovery [1]
Discovered by	M. F. Wolf
Discovery site	Heidelberg Obs.
Discovery date	5 March 1918
Designations
MPC designation	(889) Erynia
Pronunciation	/ɛˈraɪniə/
Named after	Erinyes, or Furies (Greek mythology)[2]
Alternative designations	A918 EN · 1929 BG A912 PA · 1912 PA 1918 DG
Minor planet category	main-belt [1][3] · (inner) background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	101.81 yr (37,187 d)
Aphelion	2.9428 AU
Perihelion	1.9500 AU
Semi-major axis	2.4464 AU
Eccentricity	0.2029
Orbital period (sidereal)	3.83 yr (1,398 d)
Mean anomaly	342.62°
Mean motion	0° 15m 27.36s / day
Inclination	8.1064°
Longitude of ascending node	132.53°
Argument of perihelion	278.52°
Physical characteristics
Mean diameter	16.682±0.154 km[6] 18.14±0.59 km[7]
Synodic rotation period	9.89±0.01 h[8]
Pole ecliptic latitude	(187.0°, −60.0°) (λ1/β1)[5][9] (335.0°, −74.0°) (λ2/β2)[5][9]
Geometric albedo	0.196±0.014[7] 0.230±0.042[6]
Spectral type	S (S3OS2-TH)[10] Sl (S3OS2-BB)[10]
Absolute magnitude (H)	11.0[1][3]

Orbit and classification

Erynia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,398 days; semi-major axis of 2.45 AU). Its orbit has an eccentricity of 0.20 and an inclination of 8° with respect to the ecliptic.[3] The asteroid was first observed as A912 PA (1912 PA) at the Johannesburg Observatory on 7 August 1912. The body's observation arc begins at Heidelberg Observatory on 16 March 1918, or elven nights after its official discovery observation.[1]

Naming

This minor planet was named after one of the Erinyes from Greek mythology, also known as Furies in Roman mythology. The female deities of vengeance have snakes for hair, dog's heads, coal black bodies, bat's wings, and blood-shot eyes. They tortured their victims with brass-studded scourges and inflicted plagues. The naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 86).[2]

Physical characteristics

In the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Erynia is a common stony S-type asteroid, while in the SMASS-like taxonomic variant of the survey, it is an Sl-subtype, which transitions from the S- to the uncommon L-type.[5][10]

Rotation period and poles

In January 2002, a rotational lightcurve of Erynia was obtained from photometric observations by French astronomer Laurent Bernasconi. Lightcurve analysis gave a rotation period of 9.89±0.01 hours with a high brightness variation of 0.67±0.02 magnitude, indicative of a non-spherical, elongated shape (U=3).[8] A concurring period of 9.872±0.0079 hours and an amplitude 0.47 magnitude was obtained by astronomers at the Palomar Transient Factory in April 2010 (U=2).[11][12] In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a sidereal period 9.8749±0.0005 hours, as well as two spin axes at (187.0°, −60.0°) and (335.0°, −74.0°) in ecliptic coordinates (λ, β).[9]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE) and the Japanese Akari satellite, Erynia measures (16.682±0.154) and (18.14±0.59) kilometers in diameter and its surface has an albedo of (0.230±0.042) and (0.196±0.014), respectively.[6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 18.75 kilometers based on an absolute magnitude of 11.[12]The WISE team also published a mean-diameter of (17.386±0.181 km) with a corresponding albedo of (0.2171±0.0295).[5][12]

References

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 889 Erynia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 889 Erynia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (889) Erynia

(889) Erynia ist ein Asteroid des Hauptgürtels, der am 5. März 1918 vom deutschen Astronomen Max Wolf in Heidelberg entdeckt wurde.

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- [en] 889 Erynia

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[ru] (889) Эриния

(889) Эриния (лат. Erynia) — астероид главного пояса астероидов. Астероид был открыт 5 марта 1918 года немецким астрономом Максимилианом Вольфом в Гейдельбергской обсерватории на юго-западе Германии и назван в честь богинь мести из древнегреческой мифологии Эринии[1]

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