Central Bureau for Astronomical Telegrams
CBAT "Transient Object Followup Reports"
PNV J19450648+1822422
PNV J19450648+1822422 2026 08 25.1278* 19 45 06.48 +18 22 42.2 9.0 U Sge 9 0
2026 08 25.1278
An optical transient found with the NMW-TexasTech survey (two identical Rokinon f=135mm f/2.2 telephoto lenses + unfiltered QHY600PH-M CMOS cameras): 2026-08-24.1255 >14.0 2026-08-25.1278 9.0 2026-08-25.1292 9.0 2026-08-25.1385 8.9 2026-08-25.1405 8.9 The dates are UTC. The unfiltered magnitude zero-point was calibrated using V magnitudes of Tycho-2 stars in the field. The discovery images and finder charts are available at https://tau.kirx.net/img/PNVJ19450648+1822422/ The transient appears to coincide with a variable star Gaia DR3 1824166210904571136 19:45:06.49 +18:22:42.1 ICRS at Ep=2016.0 (no significant parallax) that varies between 19.34 - 20.79 G https://vsx.aavso.org/index.php?view=detail.top&oid=10762522 The NMW-TexasTech survey operates at TTU Preston Gott Skyview Observatory near Shallowater, Texas. ---- Katie Barnhart, Kirill Sokolovsky, Darien Perla, Pragati Acharya, John Worley, Vallia Antoniou, Elias Aydi (Texas Tech University)
2026 08 25.3031
Follow-up photometry with a 0.3-m telescope + QHY268M CMOS camera located at the Preston F. Gott Skyview Observatory of Texas Tech University: 2026-08-25.3031 B=8.18 +/-0.01, V=7.75 +/-0.02, R=7.40 +/-0.02. The magnitude zero-points were set using APASS stars in the field. ---- Kirill Sokolovsky, Katie Barnhart, Darien Perla, Pragati Acharya, John Worley, Vallia Antoniou, Elias Aydi (Texas Tech University)
2026 08 25.4436
Object bright. V mag = 7.42 using 135-mm f/3.5 lens + V filter CMOS. observed by K. Yoshimoto, Yamaguchi, Japan (P87).
2026 25 48774
Follow-up photometry with a 0.05-m f/5 refractor yielded magnitudes TG = 7.4 +/-0.1, TB = 7.9 +/-0.2, TR = 7.0 +/-0.2, Seestar tri-color G,B,R channel, APASS-V,B,R reference stars, and position end figures 06s.49, 42".2 (ATLAS reference stars), observed by T. Yusa, Miyagi, Japan (D92).
2026 08 25.532
Position end figures 6s.48, 41.9" measured with 0.05m refractor + CMOS camera, J2000, Gaia DR2 positions. Gaia star 1824166210904571136 (G mag 19.8) is approximately 0.2" from measured position. Photometry - TB = 8.62, V = 7.93, TR = 7.70. Andrew Pearce, Nedlands, Western Australia
2026 08 25.532
Correction to photometry - TB = 8.27, V = 7.68 and TR = 7.38. Andrew Pearce, Nedlands, Western Australia
2026 08 25.4547
Follow-up observation by Yuji Nakamura, Kameyama, Mie, Japan: 2026 Aug. 25.4547 UT, on three frames, mag.=7.4 (8-s exp. limiting mag. 13.0) using 135-mm f/4.0 lens + unfiltered cooled CMOS camera. Position end figures 06s.46, 43".2. Nothing is visible at this location on the frames taken on 2026 Aug. 24.4571 UT (8-s exp. limiting mag. 13.0) by same instruments. --- Isao Endoh and Mikiya Sato (NAOJ)
2026 08 25.4503
Follow-up photometry results were mag B=7.89, V=7.34, R=7.06, I=6.64. comparison stars for magnitude is QW Sge from the AAVSO variable star database. position end figures 06s.48, 42".2 using 0.30-m f/4.0 reflector + CMOS. observed by K. Yoshimoto, Yamaguchi, Japan (P87).
2026 08 25.8609
Reguitti.A and Sigismondi.C report the photometric follow-up of PNV J19450648+1822422. CCD differential photometry was obtained on 2026 Aug. 25.8609 UT with a Galileo telescope guiding camera. The photometric calibration was performed using the AAVSO comparison-star chart X42979XV. HD 187321 (comparison star 71 on the AAVSO chart) was adopted as the reference star, with V = 6.95.
2026 08 26.470
I performed follow-up photometry of this object on 2026 Aug. 26.470 UT using a DWARF mini (DWARF LAB). The object was measured at 7.06 +/- 0.09 mag (approximately V), using the green channel extracted from an RGB image and calibrated against UCAC4 and Tycho-2 V magnitudes. (Kazuyoshi Imamura, Tokushima, Japan)
