September 30, 2022
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/atlas22beux-11th-mag-nova-mensa
- Novae: https://www.aavso.org/atlas22beux-11th-mag-nova-mensa-01
Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!
Event: Nova in Mensa: N Men 2022 (= ATLAS22beux = AT 2022ufh)
Discovered by: ATLAS (reported by J. Tonry et al., ATLAS reporting group)
Discovery magnitude: ATLAS orange magnitude 13.688
Discovery date: 2022 September 16.1222 UT
Coordinates (2000.0): R.A. 06 29 08.41 Decl. -71 29 38.9 (from VSX page for N Men 2022)
Spectra: Spectroscopy indicating the object to be a nova was announced by M. Toy et al. (TNS AstroNote 2022-193), who report that spectra obtained by the ePESTO+ group on 2022 Sep. 9.3818 UT show ATLAS22beux to be a galactic nova.
Observing recommendations: This interesting nova was discovered at orange ATLAS magnitude ~13.7 on Sep. 15. It brightened to magnitude ~11.5 g (ASAS-SN) on Sep. 19, faded to ~13.1 g (ASAS-SN) on Sep. 23, then brightened again to ~11.7 CV (Hambsch) on Sep 24. It is continuing to fluctuate.
Please observe N Men 2022 as it continues to evolve, with observations of all types (visual, CCD/CMOS, DSLR, spectroscopy) and multiple bands as instrumentation permits. Frequency of observation depends on the rate of decline, but Dr. Fred Walter (Stony Brook University) recommends a minimum of one observation per night per band. For spectroscopy, he recommends spectra in blue to observe He II 4686, H-beta, and the Bowen blend (4640A), in addition to H-alpha. Cadence for spectra depends on how fast the nova continues to evolve, but, he adds, "you can't go wrong with a spectrum every clear night."
Observations reported to the AAVSO: (selected from ASAS-SN and over 240 submitted at the time of compilation)
2022 Sep. 15.0697568 UT, <15.835 (ASAS-SN);
15.622253, 13.700 orange +/-0.003 (ATLAS);
16.0600201, 13.696 g +/-0.033 (ASAS-SN);
16.0625031, 13.764 g +/-0.032 (ASAS-SN);
18.3121844, 12.426 g +/-0.009 (ASAS-SN);
18.3147550, 12.409 g +/-0.008 (ASAS-SN);
19.3534222, 11.496 g +/-0.006 (ASAS-SN);
19.3559148, 11.491 g +/-0.006 (ASAS-SN);
21.0390947, 12.012 g +/-0.009 (ASAS-SN);
21.0415829, 11.996 g +/-0.009 (ASAS-SN);
22.2940086, 13.043 g +/-0.011 (ASAS-SN);
22.2965971, 13.077 g +/-0.011 (ASAS-SN);
22.32261, 12.708 CV +/-0.004 (F.-J. Hambsch, remotely from Atacama, Chile);
22.35042, 12.743 CV +/-0.004 (Hambsch);
23.27874, 12.744 CV +/-0.005 (Hambsch);
23.3181939, 13.112 g +/-0.012 (ASAS-SN);
23.3207703, 13.127 g +/-0.012 (ASAS-SN);
23.35120, 12.869 CV +/-0.005 (Hambsch);
24.27593, 11.795 CV +/-0.004 (Hambsch);
24.35102, 11.689 CV +/-0.004 (Hambsch);
24.68750, 11.5 (N. Brown, Yanchep, W. Australia);
25.27312, 11.927 CV +/-0.004 (Hambsch);
25.34844, 12.034 CV +/-0.004 (Hambsch);
26.27036, 11.720 CV +/-0.004 (Hambsch);
26.2895517, 11.878 g +/-0.007 (ASAS-SN);
26.34808, 11.719 CV +/-0.004 (Hambsch);
26.75000, 11.7 (Brown);
27.26740, 11.693 CV +/-0.006 (Hambsch);
27.2860384, 11.844 g +/-0.008 (ASAS-SN);
27.2886210, 11.816 g +/-0.008 (ASAS-SN);
27.34808, 11.635 CV +/-0.005 (Hambsch);
28.0276659, 12.127 g +/-0.011 (ASAS-SN);
28.0301505, 12.089 g +/-0.010 (ASAS-SN);
28.26636, 11.991 CV +/-0.006 (Hambsch);
28.34624, 12.036 CV +/-0.006 (Hambsch);
29.0603953, 12.006 g +/-0.010 (ASAS-SN);
29.0628614, 12.023 g +/-0.010 (ASAS-SN);
29.26360, 11.741 CV +/-0.006 (Hambsch);
29.33908, 11.692 CV +/-0.005 (Hambsch);
29.34000, 11.938 V +/-0.006 (G. Poyner, remotely using SLOOH telescope, Chile);
29.34024, 11.899 V +/-0.035(G. Williamson, remotely using SLOOH telescope, Chile);
29.34354, 11.676 CV +/-0.005 (Hambsch);
30.32981, 11.790 V +/-0.048(Williamson);
Charts: Charts with comparison stars for N Men 2022 may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations using the name N MEN 2022 or ATLAS22BEUX. When a GCVS name is assigned to this nova, please use it when submitting observations.
- Submit optical observations to the AAVSO International Database using WebObs.
- Submit spectra to the AAVSO Spectroscopy Database (AVSpec).
Congratulations to the ATLAS team on their discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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SUBMIT OBSERVATIONS TO THE AAVSO
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- Photometry/visual observations: https://www.aavso.org/webobs
- Spectroscopy: https://www.aavso.org/apps/avspec/
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