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1075 Helina

Main-belt asteroid

Field	Value
minorplanet	yes
name	1075 Helina
background	#D6D6D6
image	001075-asteroid shape model (1075) Helina.png
caption	Modelled shape of Helina from its lightcurve
discovery_ref
discoverer	G. Neujmin
discovery_site	Simeiz Obs.
discovered	29 September 1926
mpc_name	(1075) Helina
alt_names	1926 SC1930 KV
1965 CBA906 YG
A916 WH
named_after	Helij Neujmin
(discoverer's son)
mp_category	main-belt(outer)
Eos
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	110.85 yr (40,489 days)
aphelion	3.3528 AU
perihelion	2.6705 AU
semimajor	3.0116 AU
eccentricity	0.1133
period	5.23 yr (1,909 days)
mean_anomaly	156.59°
mean_motion	/ day
inclination	11.523°
asc_node	100.81°
arg_peri	250.61°
mean_diameter	km
km
km
35.52 km
km
rotation	h
h
h
h
h
pole_ecliptic_lat	{{plainlist
* (127.0°, −43.0.0°) (λ<sub>1</sub>/β<sub>1</sub>)<ref name	"Ferret" /
* (280.0°, −44.0°) (λ<sub>2</sub>/β<sub>2</sub>)<ref name	"Ferret" /}}
albedo
0.1220

spectral_type	Tholen SU
B–V 0.765
U–B 0.370
abs_magnitude	10.1510.31 (R)

1965 CBA906 YG A916 WH (discoverer's son) Eos km km 35.52 km km h h h h

(127.0°, −43.0.0°) (λ1/β1)
(280.0°, −44.0°) (λ2/β2)}}

0.1220

B–V 0.765 U–B 0.370

1075 Helina, provisional designation , is a stony Eos asteroid from the outer regions of the asteroid belt, approximately 34 km in diameter. It was discovered on 29 September 1926, by astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after the discoverer's son, Helij Neujmin.

Orbit and classification

Helina is a member the Eos family (606), the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids. It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4 AU once every 5 years and 3 months (1,909 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic.

The asteroid was first identified as at Heidelberg Observatory in December 1906. The body's observation arc begins at Simeiz Observatory in October 1926, nine days after its official discovery observation.

Naming

This minor planet was named after Helij Grigorevich Neujmin (1910–1982), a son of discoverer Grigory Neujmin. The author of the Dictionary of Minor Planet Names, Lutz Schmadel learned about the naming circumstances from Crimean astronomers I. I. Neyachenko and N. S. Chernykh (see 2325 Chernykh).

Physical characteristics

In the Tholen classification, Helina is a stony S-type asteroid with an unusual spectra (SU).

Rotation period

In March 2013, a rotational lightcurve of Helina was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 44.554 hours with a brightness variation of 0.91 magnitude (). In April 2013, European amateur astronomers Matthieu Bachschmidt, Paul Krafft, Olivier Gerteis, Hubert Gully and Luc Arnold measured a period of 44.9 hours with an amplitude of 0.64 magnitude ().

While not being a slow rotator, Helina has a longer-than average period. Its high brightness amplitude is also indicative for an elongated or irregular shape, rather than a spherical one.

Poles

The asteroid's lightcurve has also been modeled several times. It gave a concurring period of 44.6768 and 44.677 hours, respectively. Modelling in the 2018-study also gave two spin axis of (127.0°, −43.0.0°) and (280.0°, −44.0°) in ecliptic coordinates (λ, β).

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Helina measures between 26.198 and 37.93 kilometers in diameter and its surface has an albedo between 0.11 and 0.129. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.1220 and a diameter of 35.52 kilometers based on an absolute magnitude of 10.15.

Notes

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

eos-asteroids discoveries-by-grigory-neujmin named-minor-planets su-type-asteroids-(tholen) astronomical-objects-discovered-in-1926

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