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Name
  HM Sge  
AAVSO UID
000-BCH-656 (18134 observations)  
Constellation
Sagitta Sequence
J2000.0
19 41 57.08 +16 44 39.8  (295.48783 +16.74439) Search nearby
B1950.0 19 39 41.48 +16 37 33.3
Proper motion
RA: 0.0 +/- 2.6 mas/yDec: -6.6 +/- 3.3 mas/ySource: UCAC4
Galactic coord. 53.566 -3.150
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J194157.6+164433 1WGA J1941.9+1644 2E 1939.7+1637
2E 4280 2MASS J19415708+1644399 2RXS J194157.6+164433
3XMM J194157.0+164439 4XMM J194157.0+164440 AAVSO 1937+16
GSC 01602-01636 Gaia DR2 4318934003785783680 Gaia DR3 4318934003785783680
HBHA 1704-07 IOMC 1602000048 IPHAS J194157.08+164439.8
IRAS 19396+1637 N Sge 1975 N Sge 75
NSVS J1941571+164444 Nova Sge 1975 PK 053-03 2
SVS 2183 TIC 342021932 TYC 1602-1636-1
UCAC4 534-099980 WISE J194157.08+164439.9 WISEA J194157.07+164439.9
XMMOM J194157.1+164440 [KW97] 38-53  
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Variability type
NC+M
Spectral type pec(e)+M7
Mag. range
11.1 - 18.1 B
Discoverer --
Epoch
13 Jul 2021 (HJD 2459409) Ephemeris
Outburst 1975
Period 540 d
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Pulsations started to increase in amplitude again and became apparent in the Ic band (and visible in Rc with a small amplitude), while completely absent in V and B.
2 Otero, Sebastian Alberto Period is for the mira pulsations seen before the 1975 outburst.
3 GCVS Team VB A (B 14.20m, 10", 182deg). The brightness increased from 17.2m up to 11.3m pg in the interval JD2442280 - 42650. Then the light variations in the infrared region appeared with P = 550d [J.D.Bregman, BAAS 14, N4, 982, 1982., O.G.Taranova, B.F.Yudin, Pis'ma Astron. Zh.8, N2, 90, 1982.] and A(K) = 1.5m. Radio and X-ray source.
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References
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1 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)		 2012arXiv1210.0821A
2 P.R. Wozniak, S.J. Williams, W.T. Vestrand, V. Gupta, AJ 128, 2965, 2004 2004AJ....128.2965W
3 Chochol, D., et al, 2003, Long-Term Photometry of Very Slow Novae 2003BaltA..12..610C
4 Mürset, U.; Schmid, H. M., 1999, Spectral classification of the cool giants
in symbiotic systems		 1999A&AS..137..473M
5 Catalogue of Stellar Spectral Classifications (Skiff, 2005) 1999A&AS..137..473M
6 R.I.Noskova, M.V.Savel'eva, V.P.Arkhipova, V.P.Goranskij, O.D.Dokuchaeva,
Perem. Zvezdy Supplement 3, N18, 755, 1979.		 1979PZP.....3..755N
7 O.D.Dokuchaeva, Astron. Tsirk. N946, 6, 1977. 1977ATsir.946....6D
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 7.62H = 6.02K = 4.65J - K = 2.97
AllWISE W3 = -0.48W4 = -1.81W3 - W4 = 1.33
Images
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Supporting Documents
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2 JD light curve Otero, Sebastian Alberto 2026-06-01 18:29 UTC Light curve showing the mira pulsations in the Ic band but not in V, with AAVSO data, mainly from observers BVS, GCO, GSAD, DFS and RFDA.
1 Phase plot Otero, Sebastian Alberto 2026-06-01 18:26 UTC Phase plot showing the mira pulsations in the Ic band, with AAVSO data, mainly from observers BVS, GCO, GSAD and RFDA.
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Campaigns/Programs
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Revision History
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4 Otero, Sebastian Alberto 2026-06-01 18:24 UTC Period and epoch from AAVSO data (mainly from observers BVS, GCO, GSAD, DFS and RFDA). Gaia DR3 position. Spectral type from 1999A&AS..137..473M.
3 Otero, Sebastian Alberto 2012-10-25 20:26 UTC Period added.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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