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Name
  V0598 Sco  
AAVSO UID
000-BFK-868 (1362 observations)  
Constellation
Scorpius Sequence
J2000.0
17 02 46.58 -34 40 28.9  (255.69408 -34.67469) Search nearby
B1950.0 16 59 28.23 -34 36 14.0
Proper motion
RA: -4.2 +/- 4.7 mas/yDec: -4.0 +/- 4.7 mas/ySource: UCAC4
Galactic coord. 350.132 +4.287
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J17024658-3440288 CMC15 J170246.5-344028 Downes V0598 Sco
GSC2.3 S8GG045001 HV 10836 UCAC4 277-102881
USNO-A2.0 0525-25914845 USNO-B1.0 0553-0476307 VVV J170246.58-344028.79
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Variability type
UGZ/IW+E
Spectral type --
Mag. range
14.2 - 18.6 V
Discoverer --
Epoch
17 May 2025 (HJD 2460813.2633) Ephemeris
Outburst --
Period 0.15578541 d  (3.738850 h)
Rise/eclipse dur. 9%  (0.3365 h)
Remarks
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1 Otero, Sebastian Alberto Eclipses discovered visually by Rod Stubbings. Standstill between HJD 2459698 and 2459713.
2 Otero, Sebastian Alberto ASAS-SN and APASS magnitudes contaminated by 2MASS J17024665-3440214 (V= 16.2; sep. 7"). Range has been corrected.
3 Otero, Sebastian Alberto The ASAS light curve at this position is actually for the brighter and redder star (J-K 0.90) 2MASS J17024526-3440590. Colors of this star are consistent with the K5II spectrum published in IBVS 3716. Maybe they took spectra of the wrong star? The ~3 mag. change in one night suggests the UG nature might be okay and the blue object reported in 2001A&A...373..608D seems to support that.
4 Otero, Sebastian Alberto Symbiotic? Spectral type not consistent with UG. However, the report of a change of ~3 mag. in one night (IBVS 3716) is doubtful. J-K 0.68 is not particularly red and the same star appears in the Blue stellar candidates list in 2001A&A...373..608D with V= 15.94 and u-v= -0.39.
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References
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1 T. Kato, 2023, vsnet-chat #9283 --
2 Tonry, J. L.; et al., 2018, ATLAS: A High-cadence All-sky Survey System 2018PASP..130f4505T
3 Henden, A. A.; et al., 2018, AAVSO Photometric All Sky Survey (APASS) DR10 2018AAS...23222306H
4 T. Kato, 2018, vsnet-chat #8126 --
5 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0		 2017PASP..129j4502K
6 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
7 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
8 A UKST survey of blue objects towards the Galactic centre - seven
additional fields		 2001A&A...373..608D
9 IBVS #3716 1992IBVS.3716....1C
10 H.H.Swope, HA 109, N9, 1943. 1942AnHar.109...31S
External Links
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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 = 14.65H = 14.24K = 13.97J - K = 0.69
Images
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Supporting Documents
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4 Zoomed phase plot - Eclipse Otero, Sebastian Alberto 2025-06-10 03:24 UTC Phase plot zoomed into the primary minimum with ASAS-SN, ATLAS and AAVSO data.
3 Phase plot Otero, Sebastian Alberto 2025-06-10 03:23 UTC Phase plot with ASAS-SN, ATLAS and AAVSO data.
2 JD light curve Otero, Sebastian Alberto 2025-06-10 03:22 UTC Light curve showing over 100 outbursts with ASAS-SN, ATLAS and AAVSO data.
1 Standstill Otero, Sebastian Alberto 2025-06-10 03:16 UTC Light curve showing a standstill followed by an outburst with Stubbings, ATLAS and ASAS-SN data.
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Revision History
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9 Otero, Sebastian Alberto 2025-06-05 04:48 UTC Type and range from ASAS-SN, ATLAS and Stubbings data. Period, epoch and eclipse duration from ATLAS, ASAS-SN and AAVSO (Stubbings, Hambsch and Goltz) data.
8 Otero, Sebastian Alberto 2025-05-20 19:59 UTC Type from vsnet-chat 9283.
7 Otero, Sebastian Alberto 2019-07-14 04:08 UTC Type from vsnet-chat 8126. Maximum magnitude from APASS data.
6 Otero, Sebastian Alberto 2018-09-25 19:44 UTC Gaia DR2 position.
5 Otero, Sebastian Alberto 2011-09-13 23:57 UTC Classification changed based on likely identification problem. Range from IBVS 3716.
4 Otero, Sebastian Alberto 2011-09-13 23:40 UTC Reference added.
3 Otero, Sebastian Alberto 2011-09-13 23:39 UTC Primary record creation. Spectral type from IBVS 3716. Possible type from IBVS 3716 and 2001A&A...373..608D. Maximum magnitude from ASAS-3. Minimum magnitude from 2001A&A...373..608D. UCAC3 position.
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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