Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Octans
Right ascension
21h 08m 46.86357s[1]
Declination
−88° 57′ 23.3983″[1]
Apparent magnitude (V)
5.47[2]
Characteristics
Spectral type
F0 IV[3]
U−B color index
+0.13[2]
B−V color index
+0.26[2]
Variable type
δ Sct[4]
Astrometry
Radial velocity (Rv)
+11.9[5] km/s
Proper motion (μ)
RA: +26.323[1] mas/yr Dec.: +4.721[1] mas/yr
Parallax (π)
11.1005 ± 0.0616 mas[1]
Distance
294 ± 2 ly (90.1 ± 0.5 pc)
Absolute magnitude (MV)
0.86±0.09[6]
Details
Mass
1.59[7]M☉
Radius
4.4[1]R☉
Luminosity
44[1]L☉
Surface gravity (log g)
3.71[7] cgs
Temperature
7,415±252[7] K
Metallicity [Fe/H]
−0.5[1] dex
Rotational velocity (v sin i)
145[4] km/s
Age
912[7] Myr
Other designations
Polaris Australis, σ Oct, CPD−89°47, FK5 923, HD 177482, HIP 104382, HR 7228, SAO 258857[8]
Database references
SIMBAD
data
Sigma Octantis is a solitary[9] star in the Octans constellation that forms the pole star of the Southern Hemisphere. Its name is also written as σ Octantis, abbreviated as Sigma Oct or σ Oct, and it is officially named Polaris Australis (/poʊˈlɛərɪsɔːˈstreɪlɪs/).[10] The star is positioned one degree away from the southern celestial pole of the Southern Hemisphere, lying in nearly opposite direction to the North Star on the celestial sphere.
Located approximately 294 light-years from Earth, it is classified as a subgiant with a spectral type of F0 III. Sigma Octantis has an apparent magnitude of 5.5, but is slightly variable and is classified as a Delta Scuti variable.
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SigmaOctantis has an apparent magnitude of 5.5, but is slightly variable and is classified as a Delta Scuti variable. σ Octantis (Latinised to Sigma...
has a capacity of 378 passengers with 189 staterooms. Named after the SigmaOctantis, the south star, the ship's primary routes include Antarctica and the...
Brazilian territory in the northern hemisphere (and the State of Pará). The SigmaOctantis (south pole star) is small, but all the other stars turn around it....
dimmer magnitude 5.5 star on its southern axis, Polaris Australis (SigmaOctantis). From around 1700 BC until just after 300 AD, Kochab (Beta Ursae Minoris)...
is Nu Octantis, a spectral class K1 III giant star with an apparent magnitude 3.73. It is 63.3 ± 0.8 light-years distant from Earth. Beta Octantis is the...
Southern Hemisphere. It lies in the dim constellation Octans, the Octant. SigmaOctantis is identified as the south pole star, more than one degree away from...
com. Archived from the original on 2015-06-10. Retrieved 2013-11-14. "SigmaOctantis by Noah23". iTunes. 27 July 2004. "Jupiter Sajitarius by Noah23". iTunes...
Cross had to do for the southern hemisphere, as the southern pole star, SigmaOctantis, is too dim to be easily seen from Earth with the naked eye. The other...
Noah Raymond Brickley (born February 10, 1978), better known by his stage name Noah23, is a Canadian-American hip hop artist from Guelph, Ontario. He is...
case, the arc streaks are centered on the south celestial pole (near SigmaOctantis). Aiming the camera eastward or westward shows straight streaks on the...
more heavy elements and lower mass, are more unstable. Examples: SigmaOctantis (σ Octantis), an F-type giant and a Delta Scuti variable; Capella Aa (α Aurigae...
particularly bland portion of the sky, and the nominal south pole star is SigmaOctantis, which with magnitude 5.5 is barely visible to the naked eye even under...
the south celestial pole. Polaris is roughly at the north pole, while SigmaOctantis is roughly at the south pole. Setting Right Ascension – After polar...
Off", "Sunset Crater", "Viper Centipede Blizzard" & "Orphaned Ad" on SigmaOctantis (2004) John Tsunam - "Feet Not Feat" on Not Too Intelligent But Extremely...
"Coconut Bomb" from Spiral Like the 9 (2004) (track also appears on SigmaOctantis (2004) as an untitled bonus track and on Pirate Utopias (77 Lost Scrolls)...
entitled "SigmaOctantis", produced by Savillion. "Chicken Soup" was later included on the 2007 compilation Cameo Therapy, while "SigmaOctantis" appeared...
northern hemisphere for the 1908 Revised Harvard Photometry catalogue. SigmaOctantis was used for the southern hemisphere. It was then noted that "Neither...
Global Information
