wpo - TAV J1907+117 = Nova Aquila 2001 = V1548 Aql

The Astronomer quotes : Mike Collins, Everton, Bedfordshire, England, reports his discovery of a variable object in Aquila located at: RA 19h 07m 27s DEC +11 44' 09" (2000). The object was recorded with the 135mm telephoto lens for the UK Nova/Supernova Patrol on 2001 May 11.99UT at magnitude 10.9. An exposure on Apr 25 may show it at mag 12.1 but it is possible the star varying is the northern component of a close double and therefore even fainter on the latter date. An image with a large telescope is urgently required to establish candidates on the Palomar but it is certainly absent from the Guide Star Catalogue.

   Wideangle field of V1548Aql  dated   010613.99    010630.94    010701.023
NEW Nova Scorpius'01   Nova Aquila'99 [2]  Nova 1917 = CI Aql   main spectroscopy page

2001 Dec 5: Nova fades further but little change in its spectrum [143A/pixel] with Ha still dominating.
2001 Aug 16: Nova fading but little change in its spectrum [50A/pixel] with Ha still dominating

2001 July 10: Nova Aql'01 spectrogram to full MX9 res yields 42A/pixel to show the dominant Ha line and weaker Hb line in blue.

2001 June 10-13: more spectra in both colour and mono as nova fades show little change with the defining Ha recordable in a few seconds exposure. The colour spectrum has maximum saturation - the zero order real images [to right] take on a yellow cast from the transmission grating.  The low saturation defocused colour image also via MX5c camera shows pinkish hue to nova mostly due to Ha.  The original discovery image by Mike Collins [36 x 24mm photo frame + 135mm fl lens] covered x16 the area of my wide-angle CCD image of 2001 June 30 with a similar 135mm focal length lens making his discovery all the more remarkable.

2001 May 23: Split-field spectrograph allows a direct image [upper field with deep stellar penetration] and spectrum [lower field] onto the same CCD via separate exposures.

2001 May 21: Further WPO spectrograms taken in the early hours of this morning with Aquila high in southeast for a better S/N ratio. Result overlaid with an excellent match on IDS spectrogram [res = 1nm] via  the 2.5m Isaac Newton Telescope - La Palma taken 70 hrs previously.

Comparison of this nova with Nova Aql'99[1] (V1493Aql) adjacent show marked similarities but also marked differences - the latter may relate to the relative prominence of helium [He] or iron [Fe] emission lines.   Ha, Hb, Hd and OIII [double ionized oxygen ~500nm] emission lines in both spectra.  Noticeable cut-off in flux below Hb [<480nm] may indicate interstellar absorption [i.e. dust] in the line-of-sight as previously recorded in spectrum of SS433 - SNe remnant also in Aquila.  Will this nova go planetary neb with OIII becoming the most prominent line in six months time like Nova Aql 99[2] =V1494Aql?

2001 May 18:  From a series of  lo-res spectra [5nm/pixel] taken this evening all show this 'new' star has the characteristics of a nova at outburst with Ha very strong.   Judging from the spectra the object should be orange in colour. Shell star b Lyrae, with He and Ha in emission, taken during the same session included for comparison.  Check-out the other novae spectra above.  More WPO spectra to follow.  Well done Mike Collins<g>.

Mike Collins' discovery image, Nick James' telescopic field image and POSS overlay are on the The Astronomer webpage.