Alert Notice 781: Nova in Musca - N Mus 2022 (= ASASSN-22hw = AT 2022mmp)

June 14, 2022

AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/asassn-22hw-likely-galactic-nova-mag-9-musca
- Novae: https://www.aavso.org/nova-mus-2022-asassn-22hw

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Event: Nova in Musca: N Mus 2022 (= ASASSN-22hw = AT 2022mmp)

Discovered by: All-Sky Automated Survey for Supernovae (ASAS-SN) (reported by K. Z. Stanek, for the ASAS-SN team)

Discovery magnitude:  9.5 g Sloan

Discovery date: 2022 Jun 10.13 UT

Coordinates (2000.0): R.A. 13 24 31.30  Decl. -72 10 30.3  (from VSX page for N Mus 2022)

Spectra: Spectroscopy indicating the object to be a nova was obtained on 2022 June 11.4230 UT by Hamish Barker (Nelson, New Zealand). Barker's spectrum was taken with a 200-mm Newtonian and L200 Littrow spectrograph with 180lpmm grating.

Observing recommendations: Please observe N Mus 2022 as it continues to evolve, with observations of all types (visual, CCD, DSLR, PEP, spectroscopy) and multiple bands as instrumentation permits. Dr. Frederick Walter (Stony Brook University) suggests that since the nova is past peak, frequency of observation depends on the rate of decline, but should be 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 evolves, but, he adds, "you can't go wrong with a spectrum every clear night."

Observations reported to the AAVSO:
2022 Jun. 08 UT, 8.7: g (ASAS-SN, pre-discovery; reported via P. Schmeer, Saarbrücken-Bischmisheim, Germany);
10.13, 9.5 g (ASAS-SN, discovery);
10.93461, 9.8 (A. Pearce, Nedlands, W. Australia);
10.94, 10.18 B +/-0.05 (L.A.G. Monard, Calitzdorp, S. Africa via vsnet-alert);
10.94, 9.75 V +/-0.02 (Monard);
10.94, 8.45 R +/-0.03 (Monard);
10.94, 7.88 Ic +/-0.05 (Monard);
10.97847, 9.9 (A. Amorim, Florianapolis, Brazil);
10.98670, 9.8 (Pearce);
11.03504, 8.027 I +/-0.037 (F.-J. Hambsch, Mol, Belgium, remotely from Atacama, Chile);
11.03520, 9.809 V +/-0.014 (Hambsch);
11.03541, 10.059 B +/-0.021 (Hambsch);
11.03563, 8.569 R +/-0.010 (Hambsch);
11.06, 8.1: R (E. Guido, M. Rocchetto, A. Valvasori, remotely using a TEL 0.6-m f/6.5 astrograph + CCD at El Sauce Observatory, Chile, and operated by Telescope Live network);
11.06648, 10.339 B +/-0.003 (E.Gomez, Sylva, NC);
11.06679, 9.813 V +/-0.002 (Gomez);
11.445, 10.2 (P. Williams, Heathcote, NSW, Australia, bright moon);
11.55903, 9.9 (Pearce);
11.67660, 9.865 TG +/-0.009 (D. Blane, Henley-on-Klip, S. Africa);
11.77390, 9.909 TG +/-0.013 (Blane);
11.77579, 9.905 TG +/-0.02 (Blane);
11.78273, 9.926 TG +/-0.02 (Blane);
11.78969, 9.920 TG +/-0.02 (Blane);
11.79677, 9.910 TG +/-0.02 (Blane);
11.80360, 9.894 TG +/-0.02 (Blane);
11.81056, 9.893 TG +/-0.02 (Blane);
11.81751, 9.898 TG +/-0.02 (Blane);
11.82447, 9.893 TG +/-0.02 (Blane);
11.83142, 9.897 TG +/-0.02 (Blane);
11.83838, 9.901 TG +/-0.02 (Blane);
11.84535, 9.921 TG +/-0.02 (Blane);
11.85230, 9.931 TG +/-0.02 (Blane);
11.92360, 10.2 (Amorim);
12.03219, 8.324 I +/-0.037 (Hambsch);
12.03230, 8.288 I +/-0.037 (Hambsch);
12.03245, 10.138 V +/-0.014 (Hambsch);
12.03260, 10.132 V +/-0.014 (Hambsch);
12.03282, 10.298 B +/-0.022 (Hambsch);
12.03304, 10.298 B +/-0.024 (Hambsch);
12.03325, 8.709 R +/-0.012 (Hambsch);
12.03341, 8.721 R +/-0.012 (Hambsch);
12.08000, 10.4 (J. De Souza Aguiar, Campinas, Brazil);
12.51667, 10.6 (Pearce);
12.90140, 10.4 (Amorim);
13.02942, 8.569 I +/-0.037 (Hambsch);
13.02951, 8.563 I +/-0.037 (Hambsch);
13.02966, 10.350 V +/-0.015 (Hambsch);
13.02982, 10.340 V +/-0.015 (Hambsch);
13.03003, 10.435 B +/-0.023 (Hambsch);
13.03025, 10.452 B +/-0.024 (Hambsch);
13.03045, 8.868 R +/-0.012 (Hambsch);
13.03061, 8.844 R +/-0.012 (Hambsch);
13.40573, 10.590 B +/-0.002 (Pearce);
13.40649, 10.516 V +/-0.001 (Pearce);
13.40706, 8.883 R +/-0.001 (Pearce);
13.40825, 10.531 B +/-0.002 (Pearce);
13.40898, 10.484 V +/-0.001 (Pearce);
13.40955, 8.857 R +/-0.001 (Pearce);
13.41078, 10.494 B +/-0.002 (Pearce);
13.41150, 10.503 V +/-0.001 (Pearce);
13.41207, 8.871 R +/-0.001 (Pearce);
13.51103, 10.554 B +/-0.003 (Pearce);
13.51177, 10.478 V +/-0.003 (Pearce);
13.51231, 8.904 R +/-0.002 (Pearce);
13.51271, 8.523 I +/-0.002 (Pearce);
13.51332, 10.600 B +/-0.003 (Pearce);
13.51405, 10.517 V +/-0.003 (Pearce);
13.51459, 8.830 R +/-0.002 (Pearce);
13.51500, 8.548 I +/-0.002 (Pearce);
13.51563, 10.618 B +/-0.003 (Pearce);
13.51635, 10.548 V +/-0.003 (Pearce);
13.83424, 10.2 (Pearce);
13.90560, 10.8 (Amorim);
14.02000, 10.5 (De Souza Aguiar);
14.02667, 8.796 I +/-0.038 (Hambsch);
14.02678, 8.755 I +/-0.040 (Hambsch);
14.02692, 10.523 V +/-0.016 (Hambsch);
14.02708, 10.519 V +/-0.016 (Hambsch);
14.02730, 10.526 B +/-0.029 (Hambsch);
14.02751, 10.607 B +/-0.026 (Hambsch);
14.02773, 9.050 R +/-0.013 (Hambsch);
14.02788, 9.004 R +/-0.013 (Hambsch);
14.55550, 10.3 (N. Brown, Yanchep, W. Australia);
14.75069, 10.4 (Pearce);
14.83416, 10.4 (Pearce);
14.89645, 10.4 (Pearce);

Charts: Charts with comparison stars for N Mus 2022 may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations using the name N MUS 2022. 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).

Notes:

a. P. Schmeer (Saarbrücken-Bischmisheim, Germany) reports that data from the ASAS-SN Sky Patrol show that the nova had reached its maximum magnitude of 8.7: g on 2022 June 08 UT.

b. Images
- Guido et al. (see above; 2022 Jun. 11.06 UT): https://tinyurl.com/novamusca1

c. Position end figures:
- Guido et al. (see above; 2022 Jun. 11.06 UT): 31.34s, 30.2"


Congratulations to the ASAS-SN team on their discovery!

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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Information on submitting observations to the AAVSO may be found at:
 - Photometry/visual observations: https://www.aavso.org/webobs
 - Spectroscopy: https://www.aavso.org/apps/avspec/

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