Eta Sagittae (HIP 98920)

Eta Sagittae is an orange giant star in the constellation Sagitta. At 160 light years away, it shines at an apparent visual magnitude of 5.09. The iron abundance of Eta Sagittae is +0.02 (104.7% of the Sun). It is moving through the Galaxy at a speed of 45.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 19,100 and 25,500 light years from the center of the Galaxy. It will come closest to the Sun 953,000 years from now when it will brighten to magnitude 3.30 from a distance of 70 light years.

Sky position: RA 20h 5.2m, Dec +19° 59.4'

Common designations: Eta Sagittae, 16 Sagittae, HIP 98920, HD 190608, HR 7679

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Stars of the Northern Hemisphere
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Brightest stars in Sagitta:
(list all)

1

|    3.51

)   Gamma Sagittae

2

|    3.68

)   Delta Sagittae

3

|    4.39

)   Sham

4

|    4.39

)   Beta Sagittae

5

|    5.01

)   Zeta Sagittae

6

|    5.09

)   Eta Sagittae

7

|    5.33

)   13 Sagittae

8

|    5.54

)   11 Sagittae

9

|    5.65

)   1 Sagittae

10

|    5.67

)   Epsilon Sagittae

11

|    5.71

)   10 Sagittae

12

|    5.80

)   15 Sagittae

13

|    5.82

)   HR 7780

14

|    5.99

)   HR 7662

15

|    6.03

)   HR 7299

16

|    6.08

)   Gliese 746

17

|    6.11

)   HR 7216

Location of Eta Sagittae circled
Map detail from Stars of the Northern Hemisphere
Hover over other bright stars to identify or click to jump.

Galactic Orbit of Eta Sagittae
(compared to the Sun)

Eccentricity: 14.4% vs. 16.0%

Angle φ : -129.5° vs. 26.0°

Semi-major axis : 6,841 pc vs. 8,686 pc

Semi-minor axis: 6,769 pc vs. 8,574 pc

Focus-to-center: 985 pc vs. 1,388 pc

Semilatus rectum : 6,699 pc vs. 8,464 pc

Perigalacticon: 5,855 pc vs. 7,297 pc

Apogalacticon: 7,826 pc vs. 10,074 pc
 
Some Tabulated XHIP Data for Eta Sagittae
(see also: SIMBAD)

Astrometry
 2007A&A...474..653V
  Position Proper Motion
Right Ascension: 301.28947767° ±0.28 mas 29.82 ±0.31 mas/yr.
Declination: 19.99087724° ±0.26 mas 79.77 ±0.33 mas/yr.
     
Galactic Longitude: 59.18550258° 83.50 mas/yr.
Galactic Latitude: -6.23032101° 16.77 mas/yr.

Parallax: 20.34 ± 0.39 mas

Spectrography

Spectral Type: K2III 1952ApJ...116..122R.

Radial Velocity: -40.75 ±0.20 km/s [A rating] 2005A&A...430..165F.

Iron Abundance [Fe/H]: 0.02 ±0.03 dex  2011A&A...525A..71W, 2006A&A...458..609D, 1990ApJS...74.1075M.
 


Photometry
 
band magnitude Abs. Mag.
U
B 6.15 2.69
V 5.09 1.63
R
I 4.11 0.65
J 3.46 0.00
H 2.90 -0.56
K 2.71 -0.75

  B-V: +1.06       V-I: +0.98

Derivations

Heliocentric distance: 49.14 pc (1.9% margin of error)

Galactocentric distance: 7,375 pc

Transverse velocity: 19.8 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 25.0 pc 42.0 pc -5.3 pc
Velocity (U, V, W) -37.2 km/s -24.5 km/s 8.3 km/s

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