Ensiklopedia Dunia

Technopedia Center

Faculty of Engineering and Computer Science
S1 Informatics S1 Information Systems S1 Information Technology S1 Computer Engineering S1 Electrical Engineering S1 Civil Engineering

faculty of Economics and Business
S1 Management S1 Accountancy

Faculty of Letters and Educational Sciences
S1 English literature S1 English language education S1 Mathematics education S1 Sports Education

1573 Väisälä - Wikipedia

From Wikipedia, the free encyclopedia

1573 Väisälä
Discovery^[1]
Discovered by	S. Arend
Discovery site	Uccle Obs.
Discovery date	27 October 1949
Designations
MPC designation	(1573) Väisälä
Named after	Yrjö Väisälä (astronomer)^[2]
Alternative designations	1949 UA
Minor planet category	main-belt · Phocaea^[3]^[4]
Orbital characteristics^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	67.51 yr (24,659 days)
Aphelion	2.9192 AU
Perihelion	1.8243 AU
Semi-major axis	2.3717 AU
Eccentricity	0.2308
Orbital period (sidereal)	3.65 yr (1,334 days)
Mean anomaly	225.00°
Mean motion	0° 16^m 11.28^s / day
Inclination	24.553°
Longitude of ascending node	202.38°
Argument of perihelion	173.91°
Physical characteristics
Dimensions	8.43±1.90 km^[5] 9.083±0.055 km^[6] 9.146±0.066 km^[7] 9.77 km (IRAS:2)^[8]
Synodic rotation period	252 h^[a]
Geometric albedo	0.2226 (IRAS:2)^[8] 0.25±0.12^[5] 0.2818±0.0319^[6] 0.284±0.045^[9]
Spectral type	S^[3]
Absolute magnitude (H)	12.2^[6] · 12.30^[1]^[3] · 12.47^[5] · 12.84±0.50^[10]

1573 Väisälä, provisional designation 1949 UA, is a stony Phocaea asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 27 October 1949, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, Belgium.^[11] It was named for Finnish astronomer Yrjö Väisälä.^[2]

Orbit and classification

The stony S-type asteroid is a member of the Phocaea family (701), a group of asteroids with similar orbital characteristics.^[4] It orbits the Sun at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,334 days). Its orbit has an eccentricity of 0.23 and an inclination of 25° with respect to the ecliptic.^[1] Väisälä's observation arc begins on the night following its official discovery observation at Uccle, as no precoveries were taken and no prior identifications were made.^[11]

Physical characteristics

Slow rotator

In September 2011, a rotational lightcurve of Väisälä was obtained from photometric observations made by Czech astronomer Petr Pravec at Ondřejov Observatory.^[b] Its analysis gave a rotation period of 252 hours with a brightness variation of 0.76 magnitude (U=2).^[a] This makes Väisälä one of the Top 200 slow rotators known to exist. The body is also suspected to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling". As of 2017, no follow-up observations have been made of these provisional results.^[3]

Diameter and albedo

According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Väisälä measures between 8.43 and 9.77 kilometers in diameter, and its surface has an albedo between 0.222 and 0.284.^[5]^[6]^[7]^[8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2226 and a diameter of 9.77 kilometers using on an absolute magnitude of 12.30.^[3]

Naming

This minor planet was named after Finnish astronomer, Yrjö Väisälä (1891–1971), a prolific discoverer of minor planets during the late 1930s and early 1940s.^[2] In addition, a second minor planet, 2804 Yrjö, was named in his honor by pioneering Finnish female astronomer Liisi Oterma, and the lunar crater Väisälä also bears his name. The official naming citation was published by the Minor Planet Center on 31 January 1962 (M.P.C. 2116).^[12]

Notets

^ ^a ^b Pravec (2012) web: rotation period 252 hours with a brightness amplitude of 0.76 mag. Pravec, P.; Wolf, M.; Sarounova, L. (2012) Summary figures at DEFPage_Local.php?AstInfo=1573%7CVaisala Collaborative Asteroid Lightcurve Link (CALL) for (1573) Vaisala
^ Light-Curve-Analysis of (1573) Väisälä Screenshot from data

References

^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 1573 Vaisala (1949 UA)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
^ ^a ^b ^c Schmadel, Lutz D. (2007). "(1573) Väisälä". Dictionary of Minor Planet Names – (1573) Väisälä. Springer Berlin Heidelberg. p. 125. doi:10.1007/978-3-540-29925-7_1574. ISBN 978-3-540-00238-3.
^ ^a ^b ^c ^d ^e "LCDB Data for (1573) Väisälä". Asteroid Lightcurve Database (LCDB). Retrieved 29 December 2016.
^ ^a ^b "Asteroid 1573 Vaisala – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
^ ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
^ ^a ^b ^c ^d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010.
^ ^a ^b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497. Retrieved 29 December 2016.
^ ^a ^b ^c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
^ Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID 119293330. Retrieved 29 December 2016.
^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339. Retrieved 29 December 2016.
^ ^a ^b "1573 Vaisala (1949 UA)". Minor Planet Center. Retrieved 29 December 2016.
^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
1573 Väisälä at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1573 Väisälä at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

v t e Minor planets navigator
1572 Posnania 1573 Väisälä 1574 Meyer

Small Solar System bodies

Minor planets

Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Comets

Other

Categories:

Hidden categories: