David's Astronomy Pages Images - Session 1436 (2026-06-28)

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Image (S1437)

Objects	Session Notes
AT 2026iul - CV Type Transient AT 2026juw - CV Type Transient   - IC 5191 w/SN2026myp attempt failed (due to camera interference and bad guiding)   Variable Stars (photometric monitoring) - CI Cyg, AM Her, BL Lac, CY Lyr   Nearby Stars (astrometric monitoring) - None	- All-Night Session (1.7 hr). Short summer night - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 11°C (min) - CCD Temperature:  -10°/-15°C - Notes from 2026-06-28 >> - -

Observing Result

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AT 2026iul  - CV Type Transient

AT 2026iul (Cygnus) AT 2026iul (Type: CV) discovered 2026-04-07.397 UT by GEOTS Alias: GEOTS-PAPA-SHANKAR-2026-003 Discovery Magnitude 15.7 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter) Discovered in Cyg using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). Group reports a significant brightening of the Gaia DR3 variable star 2033708559892804224 (VSX). Recent observations show an increase in magnitude of >2.3 when compared to the last recorded observation from Golden Ears Observatory on 02 March 2026. ( TNS 2026iul )

AT 2026iul - 2026-06-28 (T+82.6d) Image below (2026-06-28.996) was taken 82.6 days after discovery of 2026iul Position of earlier transient (faint) is shown by white cross-hairs Measured Magnitude +14.74 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-06-28 23:57 UT (#1436019-23) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026iul on Transients 2026 Page  >>

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AT 2026juw  - CV Type Transient

AT 2026juw (Cygnus) AT 2026juw (Type: CV) discovered 2026-04-16.318 UT by GEOTS Alias: GEOTS-Balaji-2026-005, IRAS 19523+4538 Discovery Magnitude 13.8 (Clear- Filter) vs Prior Non-Detection Limiting Magnitude 18 (Clear- Filter) Discovered in Cyg using 14" f/2.0 Astrograph at Golden Ears Observatory (MPC code U55). Group reports the discovery of a variable star displaying significant variability, characterized by periods of quiescence interspersed with episodic flaring activity. The object has increased in brightness by approximately 1.8 magnitudes compared to its last recorded observation on March 30, 2025. Period analysis of ZTF light curves performed with Peranso suggests a periodicity of roughly 323 days. ( TNS 2026juw )

AT 2026juw - 2026-06-29 (T+73.7d) Image below (2026-06-29.034) was taken 73.7 days after discovery of 2026juw Position of earlier transient (distinct) is shown by white cross-hairs Measured Magnitude +12.97 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2026-06-29 00:52 UT (#1436050-54) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2026juw on Transients 2026 Page  >>

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