COMET Lovejoy (C/2013 R1)

[Christian Buil]

Une observation de la comète Lovejoy
faite le 8 novembre avec un Alpy 600 sur C11
(et un brouillard montant). En attendant que ISON
redevienne visible (peut être), c’est la comète la plus
facile actuellement.

Voir aussi la page : http://www.astrosurf.com/buil/comet/lovejoy/obs.htm

Mais depuis cette date, aucune observation possible
depuis Toulouse à cause d’une horrible météo

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A spectrum of Lovejoy taken the Nov. 8, 2013 with
a slit spectrograph (Alpy 600 on a Celestron 11
telescope + hazy night).

See also web page: http://www.astrosurf.com/buil/comet/lovejoy/obs.htm

No more observations from my south western France
observatory because the weather conditions





Christian

[Robin Leadbeater]

Another one of Lovejoy from 2013-11-22 using an objective grating and a 50mm camera lens. This one is still bright and well placed in the sky. A good target for a slit or slitless spectrograph while we wait to see if ISON survives perihelion

Robin

[Paolo Berardi]

Hi all! We would like to share our 7 december comet observation with a small Schmidt-Cassegrain telescope (C5) and Lhires III 600. The spectrograph was operating in sequence on two spectral region, from 4180 to 5200 A and from 5200 to 6130 A (configuration used for Nova Del 2013). Below the joined observed spectrum of comet. In the same session we also take the spectrum of eta CrB, a G2V type star, useful for extracting a reflectance profile.



We had no much time to take other spectral regions, so this is an attempt in strong twilight conditions to take CN 3880 (with a dedicated Lhires focusing). Emission band appears divided into R-branch and P-branch lines (not resolved).



Download observed spectra:
http://quasar.teoth.it/html/spectra/_C2 ... erardi.fit
http://quasar.teoth.it/html/spectra/_C2 ... erardi.fit

Clear sky!
Paolo and Giuseppe

[Christian Buil]

Paolo.... fabulous

Resolve CN mutiplet is a real peformance and impressive.

Your high resolution spectra are also instructive and really not frequent for amateurs
(but you work like e professional).

Here a informative comparison of one of your 7 dec. spectra and an Alpy spectra
taken by me the 29 nov. (on C11, 6 x 600 sec. exposure - high signal to noise, but
of course less resolved) :





Christian

[Paolo Berardi]

Thanks Christian!
Interesting to see the trade-off between SNR and spectral resolution.

I tried to divide the comet spectrum by a G2V one (eta CrB taken in the same observing session) but it seems there is too much noise in comet spectrum for appreciating the effect on spectral lines of metals.

This is the resultant reflectance and emission spectrum:
http://quasar.teoth.it/html/spectra/C20 ... 7_refl.png

Paolo