Authors: Kumar Venkataramani, Satyesh Ghetiya, Shashikiran Ganesh, U. C. Joshi, Vikrant K. Agnihotri, K. S. Baliyan

Abstract: Spectra of comet C/2014 Q2 (Lovejoy) were taken with a low resolution spectrograph mounted on the 0.5 m telescope at the Mount Abu Infrared Observatory (MIRO), India during January to May 2015 covering the perihelion and post-perihelion periods. The spectra showed strong molecular emission bands (C2, C3 and CN) in January, close to perihelion. We have obtained the scale lengths for these molecules by fitting the Haser model to the observed column densities. The variation of gas production rates and production rate ratios with heliocentric distance were studied. The extent of the dust continuum using the Af-rho parameter and its variation with the heliocentric distance were also investigated. The comet is seen to become more active in the post-perihelion phase, thereby showing an asymmetric behaviour about the perihelion. 

https://arxiv.org/abs/1607.06682

Submitted 22 July, 2016; originally announced July 2016.

Comments: Accepted for publication in MNRAS

Journal ref: MNRAS 463, 2137, 2016

We report optical photometry and astrometry observation of recurrent nova M31N 2008-12a (ATel #12179, #12181, #12182) on 2018 November 7.82 UT. The observation was obtained using the 0.28m Schmidt-cassegran telescope, Cepheid’s Observatory, Rawatbhata, India. The UCAC4 and PRISMv10 Catalog are used for astrometry and photometry. The V and R band magnitudes are estimated to be 18.91 +/- 0.27 and 19.06 +/- 0.37 respectively. The coordinates for the nova is RA: 00h45m28.819s, DEC: +41°54’10.05” from astrometry. We plan to monitor this interesting nova on regular basis in coming time.

Additional BVRI photometry of recurrent nova M31N 2008-12a

We report our follow-up photometric observations of recurrent nova M31N 2008-12a. The nova brightened by ~3 mag after discovery in one day and declined back to 20-21 mag in ~ 4 days after discovery (ATels #12177, #12179, #12181, #12182, #12189, #12190, #12195, #12200, #12203). The observations were obtained using the 0.28m Schmidt-Cassegrain telescope, Cepheid’s Observatory, Rawatbhata, India. The UCAC4 and PRISMv10 Catalog are used for photometry. Nova was below the detection limit (> 19.5) in our next observations taken on 2018 November 09.77 UT .

DATE(2018)     EXP(s)   BAND     MAG
Nov 8.78 UT    1800     I     19.34 +/- 0.55
Nov 8.80 UT    1800     R    19.28 +/- 0.39
Nov 8.83 UT    1800    V    19.43 +/- 0.43
Nov 8.85 UT    1800    B    19.30 +/ -0.58

http://www.astronomerstelegram.org/?read=12189

http://www.astronomerstelegram.org/?read=12204

Authors: Anastasia Kokori, Angelos Tsiaras, Billy Edwards, Marco Rocchetto, Giovanna Tinetti, Anaël Wünsche, Nikolaos Paschalis, Vikrant Kumar Agnihotri, Matthieu Bachschmidt, Marc Bretton, Hamish Caines, Mauro Caló, Roland Casali, Martin Crow, Simon Dawes, Marc Deldem, Dimitrios Deligeorgopoulos, Roger Dymock, Phil Evans, Carmelo Falco, Stephane Ferratfiat, Martin Fowler, Stephen Futcher, Pere Guerra, Francois Hurter , et al. (24 additional authors not shown)

Abstract: The Ariel mission will observe spectroscopically around 1000 exoplanets to further characterise their atmospheres. For the mission to be as efficient as possible, a good knowledge of the planets’ ephemerides is needed before its launch in 2028. While ephemerides for some planets are being refined on a per-case basis, an organised effort to collectively verify or update them when necessary does not exist. In this study, we introduce the ExoClock project, an open, integrated and interactive platform with the purpose of producing a confirmed list of ephemerides for the planets that will be observed by Ariel. The project has been developed in a manner to make the best use of all available resources: observations reported in the literature, observations from space instruments and, mainly, observations from ground-based telescopes, including both professional and amateur observatories. To facilitate inexperienced observers and at the same time achieve homogeneity in the results, we created data collection and validation protocols, educational material and easy to use interfaces, open to everyone. ExoClock was launched in September 2019 and now counts over 140 participants from more than 15 countries around the world. In this release, we report the results of observations obtained until the 15h of April 2020 for 119 Ariel candidate targets. In total, 632 observations were used to either verify or update the ephemerides of 83 planets. Additionally, we developed the Exoplanet Characterisation Catalogue (ECC), a catalogue built in a consistent way to assist the ephemeris refinement process. So far, the collaborative open framework of the ExoClock project has proven to be highly efficient in coordinating scientific efforts involving diverse audiences. Therefore, we believe that it is a paradigm that can be applied in the future for other research purposes, too. 

https://arxiv.org/abs/2012.07478

Submitted 14 December, 2020; originally announced December 2020.

Phillip Scott, Bradley Walter, Quanzhi Ye, David Mitchell, Leo Heiland, Xing Gao, Alejandro Palado, Burkhonov Otabek, Jesus Delgado Casal, Colin Hill, Alberto Garcia, Kevin B. Alton, Yenal Ogmen, Vikrant Kumar Agnihotri, Alberto Caballero

We report the discovery of a new exoplanet candidate orbiting the star GJ 3470. A total of three transits were detected by OKSky Observatory: the first one on December 23, 2019, the second one on February 27, 2020, and the third one on May 3, 2020. We estimate an average transit depth of 0.84 percent and duration of 1 hour and 2 minutes. Based on this parameter, we calculate a radius of 9.2 Earth radii, which would correspond to the size of a Saturn-like exoplanet. We also estimate an orbital period of 66 days that places the exoplanet inside the habitable zone, near the orbital distance at Earths equivalent radiation. Another twelve potential transits that do not belong to GJ 3470 b are also reported. Despite our candidate for GJ 3470 c still has to be confirmed by the scientific community, the discovery represents a turning point in exoplanet research for being the first candidate discovered through an international project managed by amateur astronomers.

https://arxiv.org/abs/2007.07373

Submitted 14 July, 2020; originally announced July 2020.