13241 Biyo
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date22 May 1998
Designations
(13241) Biyo
Named after
Josette Biyo[1]
(Filipino educator)
1998 KM41 · 1975 UB1
main-belt · Flora region
background[2]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc44.01 yr (16,073 d)
Aphelion2.4215 AU
Perihelion2.1263 AU
2.2739 AU
Eccentricity0.0649
3.43 yr (1,252 d)
125.48°
0° 17m 14.64s / day
Inclination7.3001°
56.739°
93.848°
Physical characteristics
Mean diameter
3.9 km (calculated)[4][5]
4.4±0.4 h[4][6]
2.199±0.219 h (half-period)[6]
0.24 (assumed)[4]
S[4]
V–R = 0.380±0.03[6]
14.2[3]
14.3[1]

    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. 1 2 3 4 5 6 "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.
    2. 1 2 "Asteroid 13241 Biyo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 November 2019.
    3. 1 2 3 4 "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)" (2019-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 23 November 2019.
    4. 1 2 3 4 5 6 7 "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. 1 2 3 4 5 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.
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