UltraCompCAT

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Deprecated: fgetcsv(): the $escape parameter must be provided as its default value will change in /home/jcorral/public_html/UltraCompCAT/includes/functions.php on line 52

Deprecated: fgetcsv(): the $escape parameter must be provided as its default value will change in /home/jcorral/public_html/UltraCompCAT/includes/functions.php on line 52

Deprecated: fgetcsv(): the $escape parameter must be provided as its default value will change in /home/jcorral/public_html/UltraCompCAT/includes/functions.php on line 52

Deprecated: fgetcsv(): the $escape parameter must be provided as its default value will change in /home/jcorral/public_html/UltraCompCAT/includes/functions.php on line 52

Deprecated: fgetcsv(): the $escape parameter must be provided as its default value will change in /home/jcorral/public_html/UltraCompCAT/includes/functions.php on line 52

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ID# 1

4U 1820-303

X Sgr X-4

Confirmed UCXB


RA Dec [hh:mm:ss.ss] [dd:mm:ss.ss] 18:23:40.50 -30:21:40.09 [ICRS]	ℓ b [deg] [deg] 002.788211 -07.913491

Year of discovery: 1972

(Giacconi1972)

**Basic data**
Location in Globular Cluster	NGC 6624
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	8.019 ^+0.108_-0.108	Baumgardt2021 Heasley2000 Kuulkers2003 Harris2010 Galloway2020
z [kpc]	-1.10	Baumgardt2021
Orbital period (P_orb) [min]	11.42	Stella1987
P_orb determination method	X-ray modulation
Thermonuclear X-ray burst	Short-B SB	Clark1977 Strohmayer2002a
Peak X-ray flux [erg s^-1 cm^-2] (2 - 10 keV)	5.02E-09	Costantini2012
N_H [x10²² cm^-2]	0.16±0.003	Sidoli2001
E(B-V) [mag]	0.28 ± 0.03	Harris2010
Magnitude	B=18.7	King1993a
Proposed companion	He WD (Burst modelling)	Cumming2003

**NOTES**
Wang2010 detected an UV modulation at 693.5±1.3 s, ~1% longer than the orbital period, interpreted as a superhump period. Moreover, the source shows a long term modulation at ~171 d in X-rays (e.g., Priedhorsky1984, Zdziarski2007,Chou2001b) Chou2001b measured an orbital period derivative of (-7.54±3.21)E-13 s/s. The source is detected in radio (Russell2021)

**Spectral data**
UV
Optical
X-ray	O VII, O VIII and Ne IX absorption lines (hot interstellar medium?)	Futamoto2004 Cackett2008

**Peak Optical/NIR magnitudes**
If the system is transient, quiescent magnitudes are indicated with a "q" superindex King1993a
B=18.7

Aladin finding chart

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

4U 1820-303 in Simbad

Pan-STARRS1 finding chart

Click to enlarge in new tab/window

References to finding charts

King1993a

This research has made use of NASA's Astrophysics Data System (ADS) and the SIMBAD database operated at CDS (Strasbourg, France)
Please acknowledge the use of this catalogue in any published work you derive from it.

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

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ID# 1

4U 1820-303

X Sgr X-4

RA Dec

[hh:mm:ss.ss] [dd:mm:ss.ss]

18:23:40.50 -30:21:40.09

ℓ b

[deg] [deg]

002.788211 -07.913491

Year of discovery: 1972

(Giacconi1972)

Basic data

NOTES

Spectral data

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex
King1993a

Aladin finding chart

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

Pan-STARRS1 finding chart

References to finding charts

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

« Previous object Next object » ID# 1

4U 1820-303

X Sgr X-4

RA Dec

[hh:mm:ss.ss] [dd:mm:ss.ss]

18:23:40.50 -30:21:40.09

ℓ b

[deg] [deg]

002.788211 -07.913491

Year of discovery: 1972

(Giacconi1972)

Basic data

NOTES

Spectral data

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex King1993a

Aladin finding chart

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

Pan-STARRS1 finding chart

References to finding charts

« Previous object Next object »

ID# 1

If the system is transient, quiescent magnitudes are indicated with a "q" superindex
King1993a

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