THC Science

13241 Biyo
Discovery
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	22 May 1998
Designations
MPC designation	(13241) Biyo
Named after	Josette Biyo ; (Filipino educator)
Alternative designations	1998 KM41 · 1975 UB1
Minor planet category	main-belt · Flora region; background
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 0
Observation arc	44.01 yr (16,073 d)
Aphelion	2.4215 AU
Perihelion	2.1263 AU
Semi-major axis	2.2739 AU
Eccentricity	0.0649
Orbital period (sidereal)	3.43 yr (1,252 d)
Mean anomaly	125.48°
Mean motion	0° 17m 14.64s / day
Inclination	7.3001°
Longitude of ascending node	56.739°
Argument of perihelion	93.848°
Physical characteristics
Mean diameter	3.9 km (calculated)
Synodic rotation period	4.4±0.4 h; 2.199±0.219 h (half-period)
Geometric albedo	0.24 (assumed)
Spectral type	S ; V–R = 0.380±0.03
Absolute magnitude (H)	14.2; 14.3

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

^ ^a ^b ^c ^d ^e ^f "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.
^ ^a ^b "Asteroid 13241 Biyo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 November 2019.
^ ^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.
^ ^a ^b ^c ^d ^e ^f ^g "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). Retrieved 24 April 2017. (SearchForm)
^ "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 23 November 2019.
^ ^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.
^ "Asteroid 13241 Biyo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 23 November 2019.
^ http://www.sei.dost.gov.ph/
^ 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.

External links

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
Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
13241 Biyo at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
13241 Biyo at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

[MPC-object-1] ^ ^a ^b ^c ^d ^e ^f "13241 Biyo (1998 KM41)". Minor Planet Center. Retrieved 24 April 2017.

[AstDys-object-2] "Asteroid 13241 Biyo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 November 2019.

[jpldata-3] "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)" (2019-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 23 November 2019.

[lcdb-4] ^ ^a ^b ^c ^d ^e ^f ^g "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). Retrieved 24 April 2017. (SearchForm)

[h-5] "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 23 November 2019.

[Albanesi-2011-6] 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.

[Ferret-7] "Asteroid 13241 Biyo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 23 November 2019.

[8] ttp://www.sei.dost.gov.ph/

[Philippine-Star-9] Fernandez, Rudy (2 February 2003). "Small planet named after Pinoy science teacher". Philippine Star. Retrieved 24 April 2017.

[MPC-Circulars-Archive-10] "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 April 2017.

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[10]

@@ Line 6: / Line 6: @@
  | image_size      =
  | caption         =
- | discovery_ref   = &thinsp;<ref name="jpldata" />
+ | discovery_ref   = &thinsp;<ref name="MPC-object" />
- | discovered      = 22 May 1998
  | discoverer      = [[Lincoln Near-Earth Asteroid Research|LINEAR]]
  | discovery_site  = [[Lincoln Laboratory's Experimental Test Site|Lincoln Lab's ETS]]
+ | discovered      = 22 May 1998
  | mpc_name        = (13241) Biyo
  | alt_names       = {{nowrap|{{mp|1998 KM|41}}{{·}}{{mp|1975 UB|1}}}}
  | pronounced      =
  | named_after     = [[Josette Biyo]]&thinsp;<ref name="MPC-object" /><br />{{small|(Filipino educator)}}
- | mp_category     = [[main-belt]]{{·}}[[Flora family|Flora]]&thinsp;<ref name="lcdb" />
+ | mp_category     = [[main-belt]]{{·}}[[Flora family|Flora region]]<br />[[Background asteroid|background]]&thinsp;<ref name="AstDys-object" />
  | orbit_ref       = &thinsp;<ref name="jpldata" />
- | epoch           = 4 September 2017 ([[Julian day|JD]] 2458000.5)
+ | epoch           = 27 April 2019 ([[Julian day|JD]] 2458600.5)
  | uncertainty     = 0
- | observation_arc = 41.25 yr (15,067 days)
+ | observation_arc = 44.01 [[Julian year (astronomy)|yr]] (16,073 d)
- | aphelion        = 2.4197 [[Astronomical unit|AU]]
+ | aphelion        = 2.4215 [[Astronomical unit|AU]]
- | perihelion      = 2.1272 AU
+ | perihelion      = 2.1263 AU
- | semimajor       = 2.2735 AU
+ | semimajor       = 2.2739 AU
- | eccentricity    = 0.0643
+ | eccentricity    = 0.0649
- | period          = 3.43 [[Julian year (astronomy)|yr]] (1,252 days)
+ | period          = 3.43 yr (1,252 d)
- | mean_anomaly    = 313.24[[Degree (angle)|°]]
+ | mean_anomaly    = 125.48[[Degree (angle)|°]]
- | mean_motion     = {{Deg2DMS|0.2875|sup=ms}} / day
+ | mean_motion     = {{Deg2DMS|0.2874|sup=ms}} / day
- | inclination     = 7.3016°
+ | inclination     = 7.3001°
- | asc_node        = 56.743°
+ | asc_node        = 56.739°
- | arg_peri        = 93.631°
+ | arg_peri        = 93.848°
- | mean_diameter   = 3.92 km {{small|(calculated)}}<ref name="lcdb" />
+ | mean_diameter   = {{val|3.9|ul=km}} {{small|(calculated)}}<ref name="lcdb" /><ref name="h" />
- | rotation        = {{val|4.4|0.4}} [[Hour|h]]<ref name="Albanesi-2011" />
+ | rotation        = {{val|4.4|0.4|ul=h}}<ref name="lcdb" /><ref name="Albanesi-2011" /><br />{{val|2.199|0.219|u=h}} {{small|(half-period)}}<ref name="Albanesi-2011" />
- | albedo          = 0.24 {{small|(assumed)}}<ref name="lcdb" />
+ | albedo          = {{val|0.24}} {{small|(assumed)}}<ref name="lcdb" />
- | spectral_type   = [[S-type asteroid|S]]&thinsp;<ref name="lcdb" />
+ | spectral_type   = [[S-type asteroid|S]]&thinsp;<ref name="lcdb" /><br />[[Asteroid color indices|V–R]] {{=}} {{val|0.380|0.03}}<ref name="Albanesi-2011" />
- | abs_magnitude   = 14.2<ref name="jpldata" /><ref name="lcdb" />
+ | abs_magnitude   = 14.2<ref name="jpldata" /><br />14.3<ref name="MPC-object" />
 }}
-'''13241 Biyo''', provisional designation {{mp|1998 KM|41}}, 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]].<ref name="MPC-object" />
+'''13241 Biyo''', provisional designation {{mp|1998 KM|41}}, is a background [[asteroid]] from the [[Flora family|Flora region]] of the inner [[asteroid belt]], approximately {{convert|4|km|mi|abbr=off|sigfig=2|sp=us}} 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.<ref name="Albanesi-2011" /> It was later named after Filipino educator [[Josette Biyo]].<ref name="MPC-object" />
 == Orbit and classification ==
+''Biyo'' is a non-[[Asteroid family|family]] asteroid of the main belt's [[Background asteroid|background population]] when applying the [[hierarchical clustering method]] to its [[proper orbital elements]].<ref name="AstDys-object" /><ref name="Ferret" /> Based on osculating Keplerian [[orbital elements]], the asteroid has also been classified as a member of the [[Flora family]] ({{small|[[FIN tbl#402|402]]}}), a giant [[asteroid clan]] and the largest family of stony asteroids in the main-belt.<ref name="lcdb" />
-''Biyo'' is a member of the [[Flora family]], a collisional group of [[S-type asteroid]]s asteroids, and one of the largest main-belt families. It orbits the Sun in the [[Kirkwood gap|inner]] main-belt at a distance of 2.1–2.4&nbsp;[[Astronomical unit|AU]] once every 3 years and 5 months (1,252 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.06 and an [[orbital inclination|inclination]] of 7[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It was first identified as {{mp|1975 UB|1}} at the [[Karl Schwarzschild Observatory]] in 1975, extending the body's [[observation arc]] by 23 years prior to its official discovery observation at Socorro.<ref name="MPC-object" />
+It orbits the Sun in the [[Kirkwood gap|inner]] asteroid belt at a distance of 2.1–2.4&nbsp;[[Astronomical unit|AU]] once every 3 years and 5 months (1,252 days; [[semi-major axis]] of 2.27&nbsp;AU). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.06 and an [[orbital inclination|inclination]] of 7[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It was first identified as {{mp|1975 UB|1}} at the [[Karl Schwarzschild Observatory]] in 1975, extending the body's [[observation arc]] by 23 years prior to its official discovery observation at Socorro.<ref name="MPC-object" />
+== 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.<ref>http://www.sei.dost.gov.ph/</ref> 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.<ref name="MPC-object" /><ref name="Philippine-Star" /> The official {{MoMP|13241|naming citation}} was published by the [[Minor Planet Center]] on 24 July 2002 ({{small|[[Minor Planet Circulars|M.P.C.]] 46109}}).<ref name="MPC-Circulars-Archive" />
 == Physical characteristics ==
@@ Line 46: / Line 52: @@
 === Rotation and shape ===
-In March 2011, a rotational [[lightcurve]] of ''Biyo'' was obtained from photometric observations by Italian astronomers at the Virginio Cesarini Observatory ({{small|[[IAU code#157|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 (astronomy)|magnitude]], which indicates that the body has a non-spheroidal shape ({{small|[[LCDB quality code|U=2]]}}).<ref name="Albanesi-2011" />
+In March 2011, a rotational [[lightcurve]] of ''Biyo'' was obtained from photometric observations by Italian astronomers at the Virginio Cesarini Observatory ({{small|[[IAU code#157|157]]}}) in Frasso Sabino, Italy. Lightcurve analysis gave a [[rotation period]] of 4.4 hours (twice the original reported period solution of {{val|2.199|0.219}} in the R-band) with a brightness amplitude of 0.99 [[Magnitude (astronomy)|magnitude]], which indicates that the body has an elongated, non-spheroidal shape ({{small|[[LCDB quality code|U=2]]}}). The Italian astronomers also determined a [[Asteroid color indices|V–R]] color of 0.38.<ref name="Albanesi-2011" />
 === 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)|Akari]] satellite and NASA's [[Wide-field Infrared Survey Explorer]].<ref name="jpldata" /><ref name="lcdb" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo for a [[S-type asteroid|stony asteroid]] of 0.24 – derived from [[8&nbsp;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.<ref name="lcdb" />
+For this asteroid, no observational data has been gathered by the space-based telescopes ([[IRAS]], [[Akari (satellite)|Akari]] and [[Wide-field Infrared Survey Explorer|WISE]]) that surveyed large portions of the asteroid belt.<ref name="jpldata" /><ref name="lcdb" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo for a [[S-type asteroid|stony asteroid]] of 0.24 – derived from [[8&nbsp;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.<ref name="lcdb" />
-== 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.<ref>http://www.sei.dost.gov.ph/</ref> 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.<ref name="MPC-object" /><ref name="Philippine-Star" /> The official naming citation was published by the [[Minor Planet Center]] on 24 July 2002 ({{small|[[Minor Planet Circulars|M.P.C.]] {{MoMP|13241|46109}}}}).<ref name="MPC-Circulars-Archive" />
 == References ==
@@ Line 60: / Line 62: @@
 <ref name="jpldata">{{cite web
-  |type       = 2017-01-28 last obs.
+  |type       = 2019-10-31 last obs.
   |title      = JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)
-  |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013241;cad=1
+  |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013241
   |publisher  = [[Jet Propulsion Laboratory]]
-  |accessdate = 5 July 2017}}</ref>
+  |accessdate = 23 November 2019}}</ref>
 <ref name="MPC-object">{{cite web
@@ Line 77: / Line 79: @@
   |url        = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
   |accessdate = 24 April 2017}}</ref>
+<ref name="Ferret">{{cite web
+  |title      = Asteroid 13241 Biyo – Nesvorny HCM Asteroid Families V3.0
+  |work       = Small Bodies Data Ferret
+  |url        = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=13241+Biyo
+  |accessdate = 23 November 2019}}</ref>
+<ref name="AstDys-object">{{cite web
+  |title      = Asteroid 13241 Biyo – Proper Elements
+  |publisher  = AstDyS-2, Asteroids – Dynamic Site
+  |url        = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=13241
+  |access-date= 23 November 2019}}</ref>
 <ref name="Philippine-Star">{{cite news
@@ Line 90: / Line 104: @@
   |publisher  = Asteroid Lightcurve Database (LCDB)
   |url        = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=13241%7CBiyo
-  |accessdate = 24 April 2017}}</ref>
+  |accessdate = 24 April 2017}} ([http://www.minorplanet.info/PHP/OneAsteroidInfo.php SearchForm])</ref>
+<ref name="h">{{cite web
+  |title      = Asteroid Size Estimator
+  |publisher  = CNEOS NASA/JPL
+  |url        = https://cneos.jpl.nasa.gov/tools/ast_size_est.html
+  |accessdate = 23 November 2019}}</ref>
 <ref name="Albanesi-2011">{{Cite journal
@@ Line 113: / Line 133: @@
 * [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
 * [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
-* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
 * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
 * {{AstDys|13241}}
@@ Line 123: / Line 142: @@
 {{DEFAULTSORT:Biyo}}
-[[Category:Flora asteroids|013241]]
+[[Category:Background asteroids|013241]]
 [[Category:Discoveries by LINEAR|013241]]
 [[Category:Minor planets named for people]]

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