1419 Danzig

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1419 Danzig
001419-asteroid shape model (1419) Danzig.png
Modelled shape of Danzig from its lightcurve
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date5 September 1929
Designations
(1419) Danzig
Named after
German name of the
Polish city of Gdańsk [2]
1929 RF ·1936 RD
1952 HJ4 ·1957 WO1
A917 GA
Orbital characteristics [3]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 99.90 yr (36,489 days)
Aphelion 2.6285 AU
Perihelion 1.9570 AU
2.2927 AU
Eccentricity 0.1465
3.47 yr (1,268 days)
356.63°
0° 17m 2.04s / day
Inclination 5.7254°
213.53°
232.65°
Physical characteristics
14.059±0.096 km [7]
14.139 km [8]
14.997±0.382 km [9]
15.09±0.22 km [10]
(22.0°, 76.0°) (λ11) [13]
0.2324 [14] [8]
0.2388±0.0462 [7]
0.250±0.009 [10]
0.260±0.023 [9]
S (family-based) [14]
11.20 [9]  ·11.3 [3] [10]  ·11.45±0.14 [14] [8] [11]  ·11.45 [7]  ·11.55±1.00 [15]

    1419 Danzig (prov. designation: 1929 RF) is a highly elongated Flora asteroid from the inner regions of the asteroid belt. It was discovered on 5 September 1929, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. [1] The stony S-type asteroid has a rotation period of 8.1 hours and measures approximately 14 kilometers (8.7 miles) in diameter. It was named for the city of Gdańsk (German : Danzig). [2]

    Contents

    Classification and orbit

    When applying the synthetic hierarchical clustering method (HCM) by Nesvorný, [4] Danzig is a member of the Flora family ( 402 ), a giant asteroid family and the largest family of stony asteroids in the main-belt. [16] :23 However, according to the 1995 HCM-analysis by Zappalà, [6] and HCM-analysis by Milani and Knežević (AstDys), it is a background asteroid. The latter HCM-analysis does not recognize the Flora asteroid clan. [5]

    Danzig orbits the Sun at a distance of 2.0–2.6  AU once every 3 years and 6 months (1,268 days). Its orbit has an eccentricity of 0.15 and an inclination of 6° with respect to the ecliptic. [3] In 1917, it was first observed as A917 GA at Simeiz Observatory (and Heidelberg on the following night), extending the body's observation arc by 12 years prior to its official discovery observation at Heidelberg. [1]

    Naming

    This minor planet was named after the now Polish city and port on the Baltic sea, Gdańsk (German : Danzig). The city was also honored by another minor planet, 764 Gedania . [2] Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 128 ) [2]

    Physical characteristics

    The overall spectral type for Florian asteroid is that of a stony S-type. [16] :23

    Rotation period and pole

    Lightcurve-based 3D-model of Danzig 1419Danzig (Lightcurve Inversion).png
    Lightcurve-based 3D-model of Danzig

    In November 1988, Polish astronomer Wiesław Wiśniewski obtained a rotational lightcurve of Danzig from photometric observations. It gave a well-defined rotation period of 8.0±0.1 hours with a brightness variation of 0.92 magnitude ( U=3 ). [11] In October 2002, another lightcurve obtained by Italian and French amateur astronomers Silvano Casulli and Laurent Bernasconi gave a concurring period of 8.1202±0.0001 hours and an amplitude of 0.81 magnitude ( U=3 ). [12] While Danzig has an average rotation period, it has a high brightness variation, which indicates that the body has a non-spheroidal shape. In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a period 8.11957±0.00005 hours, as well as a spin axis of (22.0°, 76.0°) in ecliptic coordinates (λ, β) ( U=n.a. ). [13]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Danzig measures 14.059 and 15.09 kilometers in diameter and its surface has an albedo between 0.238 and 0.260. [7] [9] [10] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-data, that is, an albedo of 0.2324 and a diameter of 14.139 kilometers with an absolute magnitude of 11.45. [14] [8]

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    References

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