838 Seraphina

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838 Seraphina (prov. designation: Template:Mp or Template:Mp) is a dark and large background asteroid, approximately Script error: No such module "convert". in diameter, located in the outer regions of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 24 September 1916.[1] The primitive P-type asteroid has a rotation period of 15.7 hours and is rather spherical in shape. Any reference to the origin of the asteroid's name is unknown.[2]

Orbit and classification

Seraphina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4] It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.3 AU once every 4 years and 11 months (1,802 days; semi-major axis of 2.9 AU). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.[5] The body's observation arc begins with its official discovery observation at Heidelberg Observatory on 24 September 1916.[1]

Naming

Any reference of this minor planet's name to a person or occurrence is unknown.[2]

Unknown meaning

Among the many thousands of named minor planets, Seraphina is one of 120 asteroids for which no official naming citation has been published. All of these asteroids have low numbers in between Template:Mp and Template:Mp and were discovered from 1876 up to the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[6]

Physical characteristics

In the Tholen classification, Seraphina is a very dark, primitive P-type asteroid, that falls into the wider group of the carbonaceous C-Complex.[5] In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), it is an X-type asteroid.[4][7] P-type asteroids are common in the outer asteroid belt and among the Jupiter trojans.

Rotation period

In November 2005, a rotational lightcurve of Seraphina was obtained from photometric observations by French amateur astronomer Raymond Poncy. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a low brightness variation of Script error: No such module "val". magnitude, indicative of a rather spherical shape (U=2Script error: No such module "Check for unknown parameters".).[8] Other observations include a period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude by Richard Binzel from June 1984 (U=2Script error: No such module "Check for unknown parameters".),[9] and a period of Script error: No such module "val". hours with an amplitude of Script error: No such module "val". magnitude by the Spanish group of asteroid observers, OBAS, in November 2015 (U=2Script error: No such module "Check for unknown parameters".).[10]

In 2018, Czech astronomers Josef Ďurech and Josef Hanuš published a modeled lightcurve using photometric data from the Gaia spacecraft's second data release. It showed a sidereal period of Script error: No such module "val". hours (U=2Script error: No such module "Check for unknown parameters".), and gave two spin axes at (18.0°, 4.0°) and (192.0°, 32.0°) in ecliptic coordinates (λ, β).[11][12]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Infrared Astronomical Satellite IRAS, Seraphina measures (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) kilometers in diameter and its surface has an albedo of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".), respectively.[13][14][15] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0427 and a diameter of 59.75 kilometers based on an absolute magnitude of 10.16.[12] Alternative mean-diameter measurements published by the WISE team include (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".) with corresponding albedos of (Script error: No such module "val".), (Script error: No such module "val".) and (Script error: No such module "val".).[4][12]

Two asteroid occultations of Seraphina gave a best-fit ellipse dimension of (Script error: No such module "val".) and (Script error: No such module "val".) for their respective observation on 5 February 2007 and on 20 July 2014. These timed observations are taken when the asteroid passes in front of a distant star. However, these two observations have received a poor quality rating.[4]

References

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  1. ↑ a b Script error: No such module "citation/CS1".
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  4. ↑ a b c d Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ a b c Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".

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External links

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