SUSPECTED NGC 6822
Equatorial coordinates
α = 296.186090 | 19 44 44.660000
δ = -14.778700 | -14 46 43.320000 |
|
| Constellation |
Sagittarius |
| Symbiotic IR Type |
S |
| Spectral Type |
C |
| Magnitude range (V) |
|
| Outbursts |
No |
|
|
Identifiers
| [LDB2002] 228 |
GSC – |
TYC – |
WRAY – |
| SIMBAD [LDB2002] 228 |
HIP – |
SAO – |
Hen – |
| BD – |
IRAS – |
GAIA DR2 – |
ESO – |
| HD – |
2MASS – |
WISE – |
AAVSO – |
Position
| Right ascension (°) |
296.186090 |
Parallax (mas) |
– |
Reddening E(B-V) (mag) |
0.203 ± 0.010 |
| Declination (°) |
-14.778700 |
Distance (kpc) |
500.00 ± 10.00 |
|
|
| Galactic longitude (°) |
25.340566 |
Proper motion in α (mas/yr) |
– |
|
|
| Galactic latitude (°) |
-18.341042 |
Proper motion in δ (mas/yr) |
– |
|
|
Observations
| U (mag) |
|
X-Ray |
|
Flickering |
|
| B (mag) |
|
X-Ray type |
|
Outbursts |
No |
| V (mag) |
|
IUE |
No |
Type |
|
| R (mag) |
|
IRAS flux at 12 μm (Jy) |
|
IPmax (eV) |
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| I (mag) |
|
IRAS flux at 25 μm (Jy) |
|
OVI lines |
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| G (mag) |
|
IRAS flux at 60 μm (Jy) |
|
|
|
| J (mag) |
16.72 |
IRAS flux at 100 μm (Jy) |
|
|
|
| H (mag) |
15.90 |
WISE W1 (mag) |
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|
|
| K (mag) |
15.54 |
WISE W2 (mag) |
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| L (mag) |
|
WISE W3 (mag) |
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| |
|
WISE W4 (mag) |
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Radio |
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|
Radio flux (mJy) |
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Orbit
| Orbital period (days) |
|
γ velocity (km/h) |
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Size of giant’s orbit (AU) |
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| Eccentricity |
|
RV of giant (km/h) |
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Separation (AU) |
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| Inclination (°) |
|
Inferior conj. of giant (JD) |
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Mass function |
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| Ephemeris type |
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Mass ratio |
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| Ephemeris T0 (JD) |
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Cool component
| Spectral type |
C |
Mass (M⊙) |
|
Pulsation |
|
| Eff. temperature (K) |
|
Radius (R⊙) |
|
Type |
|
| IR type |
S |
Luminosity (L⊙) |
|
Pulsation period (days) |
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| Metallicity [Fe/H] |
|
|
|
Ephemeris type |
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| |
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|
Ephemeris T0 (JD) |
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Hot component
| Type/Spectra |
|
Mass (M⊙) |
|
Spin period (min) |
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| Eff. temperature (K) |
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Radius (R⊙) |
|
Accretion disk |
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| Lower limit (K) |
|
Luminosity (L⊙) |
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|
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| Upper limit (K) |
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Links
SIMBAD CDS Portal
Notes
It was suspected to be a symbiotic star based on its spectra by Sibbons et al. (2015).
References
- Sibbons, L. F., Ryan, S. G., Napiwotzki, R., et al., 2015, A&A, 574, A102, 2015A&A…574A.102S
Last updated: May 13, 2019 @ 11:18 am
