Iota Sagittarii, an orange bright giant star in Sagittarius
Iota Sagittarii is an orange bright giant star in the constellation Sagittarius. At 182 light years away, it shines at an apparent visual magnitude of 4.12.
Iota Sagittarii (HIP 98032)
Iota Sagittarii is an orange bright giant star in the constellation Sagittarius. At 182 light years away, it shines at an apparent visual magnitude of 4.12. The iron abundance of Iota Sagittarii is -0.23 (58.9% of the Sun). It is moving through the Galaxy at a speed of 39.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,500 and 50,100 light years from the center of the Galaxy. It came closest to the Sun 1.3 million years ago when it had brightened to magnitude 2.21 from a distance of 75 light years.
Sky position: RA 19h 55.3m, Dec -41° 52.2'
Common designations: Iota Sagittarii, HIP 98032, HD 188114, HR 7581
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Brightest stars in Sagittarius:
(list all)
| Rank | Mag. | Star |
| 8 | 3.10 | Eta Sagittarii |
| 9 | 3.17 | Phi Sagittarii |
| 10 | 3.32 | Tau Sagittarii |
| 11 | 3.52 | Xi-2 Sagittarii |
| 12 | 3.76 | Manubrij |
| 13 | 3.84 | Polis |
| 14 | 3.92 | Rho-1 Sagittarii |
| 15 | 3.96 | Arkab Prior |
| 16 | 3.96 | Rukbat |
17
| 4.12
) Iota Sagittarii
| Rank | Mag. | Star |
| 18 | 4.27 | Arkab Posterior |
| 19 | 4.37 | Theta-1 Sagittarii |
| 20 | 4.43 | Terebellum |
| 21 | 4.52 | Upsilon Sagittarii |
| 22 | 4.53 | X Sagittarii |
| 23 | 4.54 | Terebellum |
| 24 | 4.55 | HR 6766 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Iota Sagittarii
(compared to the Sun)
E
ccentricity: 38.1% vs. 16.0%Angle φ : 38.9°vs. 26.0°
Semi-major axis : 11,140 pc vs. 8,686 pc
Semi-minor axis: 10,302 pc vs. 8,574 pc
Focus-to-center
: 4,239 pcvs. 1,388 pcSemilatus rectum : 9,527 pc vs. 8,464 pc
Perigalacticon: 6,901 pc vs. 7,297 pc
Apogalacticon
: 15,379 pcvs. 10,074 pcSome Tabulated XHIP Data for Iota Sagittarii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 298.81533000° ±0.20 mas | 21.90 ±0.80 mas/yr. |
| Declination: | -41.86841349° ±0.10 mas | 57.80 ±0.80 mas/yr. |
| Galactic Longitude: | 357.96888964° | 61.03 mas/yr. |
| Galactic Latitude: | -29.11230341° | -9.79 mas/yr. |
Parallax: 17.94 ± 0.21 mas
Spectrography
Spectral Type: K0 II/III 1978MSS...C02....0H.
Radial Velocity: 35.80 ±0.70 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
-0.23 dex
1992MNRAS.256..535J.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 5.18 | 1.45 |
| V | 4.12 | 0.39 |
| R | ||
| I | 3.15 | -0.58 |
| J | 2.07 | -1.66 |
| H | 1.45 | -2.28 |
| K | 1.39 | -2.34 |
B-V: +1.06 V-I: +0.97
Derivations
Heliocentric distance: 55.73 pc (1.2% margin of error)
Galactocentric distance: 7,351 pc
Transverse velocity: 16.3 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 48.7 pc | -1.7 pc | -27.1 pc |
| Velocity (U, V, W) | 30.6 km/s | 15.0 km/s | -19.7 km/s |