UltraCompCAT A Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries

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ID# 34

SAX J1806.5-2215

SWIFT J1806.5-2223, SAX J1806-221

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:06:32.17  -22:14:17.32                      [ICRS]

ℓ                      b [deg]                            [deg] 008.159359  -00.699213

Year of discovery: 1996-1997

(intzand1999)

Basic data

Location in Globular Cluster
Type of accretor	NS	Transient (Long outburst)
Distance [kpc] (other distances)	<4.8 (H), <6.2 (He)	Galloway2020 Cornelisse2002a
z [kpc]	-0.08	Galloway2020
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B IB	Cornelisse2002a IntZand2019
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	6.60E-10	delsanto2012
NH [x1022 cm-2]	4.2±0.6	delsanto2012
E(B-V) [mag]
Magnitude	K=17.25±0.03 qK>18.2	Kaur2017 Kaur2017
Proposed companion

NOTES

The source was still detected by INTEGRAL in 2015 October (Sguera2015).

Spectral data

UV
Optical
X-ray	Featureless	Degenaar2011b

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Kaur2017 Shaw2017
K=17.25±0.03, qK>18.2, H=17.94±0.06, K_s = 17.22±0.02, qH>19.00

Aladin finding chart

Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red

SAX J1806.5-2215 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Shaw2017Kaur2017