Nu Caeli (ν Caeli) is a yellow-white hued

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Caelum. It has an apparent visual magnitude of 6.07, which indicates it is near the lower limit on brightness that is visible to the naked eye. According to the

Bortle scale The Bortle scale (also known as the Bottle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by lig ...

, the star can be viewed from dark suburban skies. Based upon an annual parallax shift of as seen from Earth, this star is located from the Sun. Houk (1978) listed a

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...

of F2/3 V for Nu Caeli, which would indicate this is an F-type main-sequence star. In contrast, Malaroda (1975) assigned it to class F1 III-IV, which would suggest it is a more

evolved Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation t ...

F-type subgiant/ giant transitional object. It is an estimated 880 million years old with 1.34 times the

mass of the Sun The solar mass () is a standard unit of mass in astronomy, equal to approximately . It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and black holes. It is approximately equal to the mass ...

. The star is radiating eight times the Sun's luminosity from its

photosphere The photosphere is a star's outer shell from which light is radiated. The term itself is derived from Ancient Greek roots, φῶς, φωτός/''phos, photos'' meaning "light" and σφαῖρα/''sphaira'' meaning "sphere", in reference to it ...

at an

effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ...

of . A companion is listed in multiple star catalogues. It is a 10th-magnitude star about away, much further away than ν Caeli and unrelated.

References

External links

HR 1557
VizieR Bright Star Catalogue entry
CCDM J04503-4119
Vizier Catalog of Components of Double and Multiple stars
Nu Caeli
Aladin Image
Wikisky
{{DEFAULTSORT:HD 30985 F-type main-sequence stars F-type subgiants F-type giants Caeli, Nu Caelum Durchmusterung objects 030985 022488

1557 __NOTOC__ Year 1557 (Roman numerals, MDLVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. Events January–June * March – The Takeda clan Siege of Katsurayama, besiege Kat ...