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NGC 6894
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NGC 6894 (also PK 069-02 1) is a magnitude +12.3 planetary nebula located in the constellation Cygnus. The planetary nebula was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Datchet, England on the 17th July 1784. Righ...
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NGC 6940
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Title: A dearth of planetary transits in the direction of NGC 6940 Authors: Ben Hood, Andrew Collier Cameron, Stephen R. Kane, D. M. Bramich, Keith Horne, Rachel A. Street, I. A. Bond, A. J. Penny, Y. Tsapras, A. Quirrenbach, N. Safizadeh, D. Mitchell, J. Cooke A survey of planetary transits in the di...
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UX Arietis
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Title: The Flaring Corona of UX Arietis Authors: Eduardo Ros, Maria Massi (MPIfR) Here we present observational results on the RS CVn star UX Arietis from four very-long-baseline interferometry observations distributed in time to cover the rotational period of 6.44 days. The data are better fit...
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NGC 6790
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Title: Raman Scattered HeII 6545 in the Young and Compact Planetary Nebula NGC 6790 Authors: Eun-Ha Kang, Hee-Won Lee, Byeong-Cheol Lee We present the high resolution spectra of the youn and compact planetary nebula NGC 6790 obtained with the echelle spectrograph at Bohyunsan Optical Astronomy...
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NGC 6603
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NGC 6603 (also ESO 590-SC17, Melotte 197, Collinder 374 and OCL 36) is a magnitude +11.4 open star cluster located 9,400 light-years away in the constellation Sagittarius. The cluster consists of about 30 stars in a field of about 5 arc minutes in diameter, and situated within the brightest part of s...
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NGC 6604
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A Cluster Within a Cluster The star cluster NGC 6604 is shown in this new image taken by the Wide Field Imager attached to the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. It is often overlooked in favour of its more prominent neighbour, the Eagle Nebula (also known as Messier 16),...
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NGC 6749
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NGC 6749 (also Berkeley 42, GCL 107 and OCL 91) is a magnitude +12.4 globular star cluster located 25,800 light-years away in the constellation Aquila. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Windsor Road, Sl...
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EC 14012-1446
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Title: The pulsating DA white dwarf star EC 14012-1446: results from four epochs of time-resolved photometry Authors: G. Handler, E. Romero-Colmenero, J. L. Provencal, K. Sanchawala, M. A. Wood, I. Silver, W.-P. Chen The pulsating DA white dwarfs are the coolest degenerate stars that undergo se...
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NGC 6565
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NGC 6565 (also ESO 456-70, HD 166468 and PK 3-4.5) is a magnitude +11.6 planetary nebula located 14,000 light-years away in the constellation Sagittarius. The planetary nebula was discovered by American astronomer Edward Charles Pickering using a 38.1 cm (15 inch) refractor at the Harvard Coll...
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NGC 6595
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NGC 6595 (also 6590, IC 4700, ESO 590-SC15, Sh 2-37, Ced 157b and OCL 31) is a magnitude +7.0 emission nebula and open star cluster located in the constellation Sagittarius. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescop...
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NGC 6716
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NGC 6716 (also Collinder 393, ESO 592-SC5 and OCL 46) is a magnitude +7.5 open star cluster located 2,573 light-years away in the constellation Sagittarius. The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at Windsor Ro...
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NGC 6644
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NGC 6644 (also PK 8-7.2, HD 170839, Hen 2-408 and ESO 522-PN33) is a magnitude +10.7 planetary nebula located in the constellation Sagittarius. The central white dwarf star has an apparent magnitude of +15.9 The planetary nebula was discovered by American astronomer Edward Charles Pickering us...
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NGC 6631
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Title: CCD BVRI and 2MASS Photometry of the Poorly Studied Open Cluster NGC 6631 Author: A. L. Tadross, R. Bendary, H. Priya, A. Essam, A. Osman Here we have obtained the BVRI CCD photometry down to a limiting magnitude of V~ 20 for the southern poorly studied open cluster NGC 6631. It is observed from t...
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NGC 6638
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NGC 6638 (also ESO 522-SC30 and GCL 95) is a magnitude +9.2 globular star cluster located 30,600 light-years away in the constellation Sagittarius. The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshir...
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Sun-like stars
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Brightness Variations of Sun-like Stars: The Mystery Deepens An extensive study made with ESO's Very Large Telescope deepens a long-standing mystery in the study of stars similar to the Sun. Unusual year-long variations in the brightness of about one third of all Sun-like stars during the latter...
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