1534 Näsi

1534 Näsi
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Observatory
Discovery date 20 January 1939
Designations
MPC designation 1534 Näsi
Named after
 Näsijärvi (lake)[2]
1939 BK · 1933 UQ
1957 EA · 1960 UB
1962 JA · A915 VB
A924 WE · A924 YE
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 91.32 yr (33354 days)
Aphelion 3.4163 AU (511.07 Gm)
Perihelion 2.0416 AU (305.42 Gm)
2.7290 AU (408.25 Gm)
Eccentricity 0.25188
4.51 yr (1646.6 d)
86.437°
0° 13m 7.068s / day
Inclination 9.7925°
62.137°
42.922°
Earth MOID 1.06871 AU (159.877 Gm)
Jupiter MOID 1.83048 AU (273.836 Gm)
Jupiter Tisserand parameter 3.288
Physical characteristics
Dimensions 22.12 km[4]
19.51±0.36 km[5]
27.52±6.50 km[6]
22.11 km (derived)[3]
Mean radius
 11.06±0.45 km
7.94 h (0.331 d)[1][7]
9.75 h[8]
7.9338±0.0003 h[9]
0.0754[4]
0.100±0.004[5]
0.035±0.015[6]
0.0721 (derived)[3]
0.0754±0.006[1]
SMASS = Cgh
C [3]
11.8

    1534 Näsi, provisional designation 1939 BK, is a rather eccentric, carbonaceous asteroid from the outer region of the asteroid belt, about 22 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland, on 20 January 1939.[10]

    The C-type asteroid, classified as a Cgh-subtype in the SMASS taxonomy, orbits the Sun at a distance of 2.0–3.4 AU once every 4 years and 6 months (1,647 days). Its orbit shows a notable eccentricity of 0.25 and is tilted by 10 degrees to the plane of the ecliptic. It has a rotation period of 7.9 hours[7][9] superseding an earlier observation from the 1990s that gave a somewhat longer period.[8] According to the surveys carried out by IRAS, Akari, and WISE/NEOWISE, the body has an albedo between 0.04 and 0.10.[4][5][6]

    The minor planet's name is derived from the Finnish lake Näsijärvi, sometimes called "Näsi". The large lake measures 256 square kilometres (99 sq mi) in size and is located only 95 metres above sea level.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1534 Nasi (1939 BK)" (2015-03-11 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1534) Näsi. Springer Berlin Heidelberg. p. 122. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 "LCDB Data for (1534) Nasi". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved November 2015.
    5. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
    6. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; Cabrera, M. S. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    7. 1 2 Sauppe, Jason; Torno, Steven; Lemke-Oliver, Robert; Ditteon, Richard (December 2007). "Asteroid Lightcurve Analysis at the Oakley Observatory - March/April 2007". The Minor Planet Bulletin 34 (4): 119–122. Bibcode:2007MPBu...34..119S. ISSN 1052-8091. Retrieved November 2015.
    8. 1 2 de Sanctis, M. C.; Barucci, M. A.; Angeli, C. A.; Fulchignoni, M.; Burchi, R.; Angelini, P. (October 1994). "Photoelectric and CCD observations of 10 asteroids". Planetary and Space Science: 859–864. Bibcode:1994P&SS...42..859D. doi:10.1016/0032-0633(94)90066-3. ISSN 0032-0633. Retrieved November 2015.
    9. 1 2 Galád, A. (May 2010). "Accuracy of calibrated data from the SDSS moving object catalog, absolute magnitudes, and probable lightcurves for several asteroids". Astronomy and Astrophysics 514: 10. Bibcode:2010A&A...514A..55G. doi:10.1051/0004-6361/201014029. Retrieved November 2015.
    10. ↑ "1534 Nasi (1939 BK)". Minor Planet Center. Retrieved November 2015.

    External links


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