M 4-12

Constellation
Aquila

Equatorial coordinates
α = 19 13 05.447
δ = +15 46 39.714

Galactic coordinates
l = 49.4103°
b = 2.4753°

Suspected	2001^Ref
Re-classified	2015^Ref
Type	WD+WD^Ref

Identifiers

M 4-12	IRAS 19108+1541	GSC2.4.2 N2CY173813	AAVSO 000-BKR-766
SIMBAD PN M 4-12	Pan-STARRS 126932882727173793	SAO -	VSX 249541
GAIA DR3 4513170261953875840	SkyMapper -	WRAY -	GCVS -
2MASS J19130545+1546399	HIP -	Hen 2-428	BD -
WISE J191305.45+154639.8	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	-
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	-
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-

Position

Right ascension (°)	288.2727^Ref	Parallax (mas)	0.224±0.075^Ref	Reddening E(B-V) (mag)	1.69±0.13^Ref ^{, Note}
Declination (°)	15.7777^Ref	Distance (kpc)	4.08^Ref ^{, Note}, 3.27^Ref ^{, Note}
Galactic longitude (°)	49.4103^Ref	Proper motion in α (mas/yr)	-2.17±0.07^Ref
Galactic latitude (°)	2.4753^Ref	Proper motion in δ (mas/yr)	-12.55±0.06^Ref

Links

SIMBAD CDS Portal

Notes

The suspicion of being a symbiotic star for this object was raised by Rodríguez et al. (2001) due to the presence of an aged, extended nebula with a dense nebular core. Subsequently, in 2015, the discovery of a double degenerate core with a combined mass exceeding the Chandrasekhar limit was reported (Santander-García et al., 2015).

References

Reindl, N., Schaffenroth, V., Miller Bertolami, M. M. et al., 2020, A&A, 638, A93, 2020A&A...638A..93R
Rodríguez, M., Corradi, R. L. M., Mampaso, A., 2001, A&A, 377, 1042, 2001A&A...377.1042R
Santander-García, M., Rodríguez-Gil, P., Corradi, R. L. M. et al., 2015, Nature, 519, 7541, 63, 2015Natur.519...63S