13241 Biyo

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13241 Biyo
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date22 May 1998
MPC designation(13241) Biyo
Named after
Josette Biyo[2]
(Filipino educator)
1998 KM41 · 1975 UB1
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc41.25 yr (15,067 days)
Aphelion2.4197 AU
Perihelion2.1272 AU
2.2735 AU
3.43 yr (1,252 days)
0° 17m 15s / day
Physical characteristics
Mean diameter
3.92 km (calculated)[3]
4.4±0.4 h[4]
0.24 (assumed)[3]

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.[2]

Orbit and classification[edit]

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.[1] 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.[2]

Physical characteristics[edit]

Rotation and shape[edit]

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).[4]

Diameter and albedo[edit]

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.[1][3] 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.[3]


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.[5] 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.[2][6] The official naming citation was published by the Minor Planet Center on 24 July 2002 (M.P.C. 46109).[7]


  1. ^ a b c d e "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)" (2017-01-28 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
  2. ^ a b c d "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.
  3. ^ a b c d e f g "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). Retrieved 24 April 2017.
  4. ^ a b 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.
  5. ^ http://www.sei.dost.gov.ph/
  6. ^ Fernandez, Rudy (2 February 2003). "Small planet named after Pinoy science teacher". Philippine Star. Retrieved 24 April 2017.
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 April 2017.

External links[edit]