Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J15030519+2202041

TCP J15030519+2202041   2026 05 08.3260*  15 03 05.19 +22 02 04.1  13.9 U             Boo       9 0


2026 05 08.3260

Dwarf nova candidate found with the NMW-TexasTech survey using two identical 135mm telephoto lenses + unfiltered QHY600M CMOS cameras. The transient was first detected on 2026-05-08.3260 UTC at CV=13.95 with one camera and confirmed in images taken with the second camera 78 minutes later on 2026-05-08.3803 at CV=14.01. The magnitude difference is not significant given the expected photometric uncertainty of 0.06 mag. The object was not detected above the magnitude limit of CV~15 on the images taken the previous night on 2026-05-07.4551. A blue Pan-STARRS 1 DR2 source PS1 134442257714871804 (g=21.38 +/-0.04, r=21.50 +/-0.05) is located at 15:03:05.16 +22:02:03.6 J2000, just 0.6" from the measured position of the transient (NMW-TexasTech image scale is 5.9"/pix). The plate-solved FITS images, finder charts and animations produced from the NMW-TexasTech images are available at https://tau.kirx.net/img/TCPJ15030519+2202041/ The NMW-TexasTech survey operates at TTU Preston Gott Skyview Observatory (Shallowater, Texas). ----- Kirill Sokolovsky, Katie Barnhart, Darien Perla, Vallia Antoniou, Elias Aydi (Texas Tech University)



2026 05 9.948

Farina.A, Andreoli.V, Balcon.C, Carli.D, Reguitti.A and Ochner.P, report the classification of TCP J15030519+2202041. A low-resolution spectrum was obtained with the 1.22-m telescope and B&C spectrograph (dispersion 2.25 Å/pixel) located in Asiago (Italy) on 2026-05-9.948 UT. The spectrum shows a blue continuum without Balmer lines, instead there are HeI emissions 706.5 and 667.8 nm and HeI absorption at 587.6; 447.1; 438.8; 414.4; 402.6; 381.9; 370.5 and 363.4 nm. A possible progenitor was found in GAIA DR3 database (Gaia collaboration et al. 2023) DR3 1261910766509656448 with an estimated g-mag 21.2 ± 0.1 that means Δmag ≈ 7.3.These characteristics are consistent with a cataclysmic variable Helium-rich. We propose to classify this target as a Helium-rich dwarf nova


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