13241 Biyo, provisional designation 1998 KM41, is a background asteroid from the Flora region of the inner asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 22 May 1998, by the Lincoln Near-Earth Asteroid Research team (LINEAR) at the U.S. Lincoln Laboratory Experimental Test Site in Socorro, New Mexico. The presumed S-type asteroid has a rotation period of 4.4 hours and likely an elongated shape.[6] It was later named after Filipino educator Josette Biyo.[1]

Orbit and classification

Biyo is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[2][7] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid clan and the largest family of stony asteroids in the main-belt.[4]

It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.4 AU once every 3 years and 5 months (1,252 days; semi-major axis of 2.27 AU). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.[3] It was first identified as 1975 UB1 at the Karl Schwarzschild Observatory in 1975, extending the body's observation arc by 23 years prior to its official discovery observation at Socorro.[1]

Naming

This minor planet was named after Josette Biyo (born 1958), a Filipino educator, former executive director of the Philippine Science High School System and now the director of Department of Science and Technology- Science Education Institute.[8] The naming was part of the International Excellence in Teaching Award she received during the Intel International Science and Engineering Fair held in Louisville, Kentucky, in 2002, when she was a teacher at the Philippine Science High School in Iloilo, Philippines. Biyo was the first Asian teacher to win the Intel Excellence in Teaching Award.[1][9] The official naming citation was published by the Minor Planet Center on 24 July 2002 (M.P.C. 46109).[10]

Physical characteristics

Rotation and shape

In March 2011, a rotational lightcurve of Biyo was obtained from photometric observations by Italian astronomers at the Virginio Cesarini Observatory (157) in Frasso Sabino, Italy. Lightcurve analysis gave a rotation period of 4.4 hours (twice the original reported period solution of 2.199±0.219 in the R-band) with a brightness amplitude of 0.99 magnitude, which indicates that the body has an elongated, non-spheroidal shape (U=2). The Italian astronomers also determined a V–R color of 0.38.[6]

Diameter and albedo

For this asteroid, no observational data has been gathered by the space-based telescopes (IRAS, Akari and WISE) that surveyed large portions of the asteroid belt.[3][4] The Collaborative Asteroid Lightcurve Link assumes an albedo for a stony asteroid of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.2.[4]

References

  1. ^ a b c d e f "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.
  2. ^ a b "Asteroid 13241 Biyo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 November 2019.
  3. ^ a b c d "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)" (2019-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 23 November 2019.
  4. ^ a b c d e f g "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). Retrieved 24 April 2017. (SearchForm)
  5. ^ "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 23 November 2019.
  6. ^ a b c d e Albanesi, Raniero; Calabresi, Massimo; Haver, Roberto (October 2011). "Photometry of Asteroid 13241 Biyo". The Minor Planet Bulletin. 38 (4): 181–182. Bibcode:2011MPBu...38..181A. ISSN 1052-8091. Retrieved 24 April 2017.
  7. ^ "Asteroid 13241 Biyo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 23 November 2019.
  8. ^ "Home". sei.dost.gov.ph.
  9. ^ Fernandez, Rudy (2 February 2003). "Small planet named after Pinoy science teacher". Philippine Star. Retrieved 24 April 2017.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 April 2017.
Allikas: https://en.wikipedia.org/wiki/13241_Biyo
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