|Discovery site||Lincoln Lab's ETS|
|Discovery date||22 May 1998|
|MPC designation||(13241) Biyo|
|Josette Biyo 
|1998 KM41 · 1975 UB1|
|main-belt · Flora |
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 0|
|Observation arc||41.25 yr (15,067 days)|
|3.43 yr (1,252 days)|
|0° 17m 15s / day|
|3.92 km (calculated)|
13241 Biyo, provisional designation 1998 KM41, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 4 kilometers 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. It was later named after Filipino educator Josette Biyo.
Orbit and classification
Biyo is a member of the Flora family, a collisional group of S-type asteroids asteroids, and one of the largest main-belt families. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 5 months (1,252 days). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic. 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.
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) with a brightness amplitude of 0.99 magnitude, which indicates that the body has a non-spheroidal shape (U=2).
Diameter and albedo
The asteroid has not been surveyed by none of the space-based telescopes, such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer. 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 this orbital family – and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.2.
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 . 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. The official naming citation was published by the Minor Planet Center on 24 July 2002 (M.P.C. 46109).
- "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)" (2017-01-28 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
- "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.
- "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). Retrieved 24 April 2017.
- 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.
- Fernandez, Rudy (2 February 2003). "Small planet named after Pinoy science teacher". Philippine Star. Retrieved 24 April 2017.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 April 2017.
- DOST's 50 great Men And Women Of Science – 8. Josette Biyo, The Manila Times, 2008
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- 13241 Biyo at the JPL Small-Body Database