1534 Näsi
asteroid
1534 Näsi (provisional designation 1939 BK) is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 20 kilometers in diameter.
It was discovered on 20 January 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, and later named for the Finnish lake Näsijärvi.
Orbit and classification
Näsi orbits the Sun in the central main-belt at a distance of 2.0–3.4 AU once every 4 years and 6 months (1,646 days). Its orbit has an eccentricity of 0.25 and an inclination of 10° with respect to the ecliptic. It was first identified as A915 VB at Simeiz Observatory in 1915. The body's observation arc begins 15 years prior to its official discovery with its identification as 1924 YE at Heidelberg Observatory.
Physical characteristics
Lightcurve observations
In April 2007, the so-far best rated rotational lightcurve of Näsi was obtained by Jason Sauppe at Oakley Observatory in the United States. The lightcurve analysis gave a rotation period of 7.94 hours with a brightness variation of 0.35 magnitude (U=3-).
Periods from other photometric observations were obtained by astronomers René Roy in May 2016 (5.98 hours, Δ0.47 mag, U=2+), Giovanni de Sanctis in the 1990s (9.75 hours, Δ0.22 mag, U=2), Adrián Galád in October 2005 (7.9338 hours, Δ0.51 mag, U=2-), and a period of 7.93161 hours modeled from various data sources and published in 2016 (U=n.a.).
Spectral type, diameter and albedo
In the SMASS taxonomy, the carbonaceous C-type asteroid is also classified as a Cgh-subtype.
The public source identifies “1534 Näsi” as asteroid. This brief keeps that definition visible, then builds a research path around Näsi and asteroid.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 5, 2026. The linked authority identifier is Q140524. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1534, 1939, 1915 and 1924.
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This entry incorporates text from “1534 Näsi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.