Photometric observations of 9 Near-Earth Objects

Szabó, Gy. M.; Csák, B.; Sárneczky, K.; Kiss, L. L.

doi:10.1051/0004-6361:20010813

Cited by 17 publications

(13 citation statements)

References 15 publications

(15 reference statements)

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“…1.5-times the FWHM of stellar profiles. This is quite close to the aperture of the optimal S/N (1.3 × FWHM, Szabó et al 2001b), and contains 85% of the starlight. The total photon noise (star+background) was 0.…”

Section: Observationssupporting

confidence: 59%

Frozen to death? Detection of comet Hale-Bopp at 30.7 AU

Szabó

Sárneczky

Kiss

2011

A&A

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Context. Comet Hale-Bopp (C/1995 O1) has been the most interesting comet ever encountered by modern astronomy, which continued to display significant activity at a solar distance of 25.7 AU. It is unclear when and how this activity will finally cease. Aims. We present new observations with the ESO 2.2 m telescope at La Silla to monitor the activity of Hale-Bopp at 30.7 AU solar distance. Methods. On 2010-12-04, 26 CCD images were taken with 180 s exposure times for photometry and morphology. Results. The comet was detected in R and had a total brightness of 23. m 3 ± 0. m 2, which corresponds to an absolute brightness of R(1, 1, 0) = 8. m 3. The profile of the coma was star-like at a seeing of 1. 9, without any evidence of a coma or tail extending farther than 2. 5 (=55 000 km in projection) and exceeding 26.5 mag/arcs 2 surface brightness. The measured total brightness corresponds to a relative total reflecting surface, a R C, of 485 km 2 , nine times less than three years before. The calculated a R C value would imply a nucleus with 60−65 km radius assuming 4% albedo. This size estimate contradicts significantly the previous results scattering around 35 km. Conclusions. We propose that the comet may still be in a low level of activity, despite the lack of a prominent coma. Alternatively, if the nucleus is already dormant, the albedo should be as high as 13%, assuming a radius of 35 km. With this observation, Hale-Bopp has become the most distant comet ever observed, far beyond the orbit of Neptune.

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Section: Observationssupporting

confidence: 59%

Frozen to death? Detection of comet Hale-Bopp at 30.7 AU

Szabó

Sárneczky

Kiss

2011

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“…Unfiltered photometry was carried out at the University of Szeged (Hungary) using a 0.28-m telescope and SBIG ST-6 CCD camera. These observations were referred to the JATE asteroid survey (see Szabò et al 2001). A 0.70-m telescope with CCD camera and V filter were used at Kharkiv Observatory.…”

Section: Observations Of Three Main Belt Asteroidsmentioning

confidence: 99%

Photometry and models of selected main belt asteroids

Michałowski

Kaasalainen

Marciniak

et al. 2005

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“…Our group has been working on a photometric project addressing rotational properties of main-belt and Near-Earth asteroids since 1998 (Sárneczky et al 1999, Szabó et al 2001. The main aim of this project is to extend available data toward fainter and therefore smaller minor planets.…”

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confidence: 99%