Hertford  Astronomy Group

Terry’s Sky Notes

This month Hydra (Sea Serpent) which can be found low in the south-east below Leo. It is the largest of the 88 constellations, extending over a quarter of the night sky. Its stars are not particularly brilliant, the brightest, at magnitude 2, being Alphard (α Hydrai) – an orange giant, spec.type K 3II-III, 50x larger but only 3x the mass of our Sun and 117 light-years away. (RA 09h 27m  Dec -08° 39̕). Nearing the end of its life cycle, having shredded most of its hydrogen, it is likely to  become a white dwarf star.   The star chart also indicates Spica (α Virginis) one of the brightest stars in the sky. It is actually a close binary pair that rotates around each other in just 4 days. Due to this closeness and the gravitational interaction, their shapes are   more egg shaped than spherical. Star A is a blue giant variable  spec.type B1 III-V. Its companion is spec.type B2 V (RA 13 h 25m Dec -11° 09̕  ). They are 250 light-years away.
Hertford  Astronomy Group

Terry’s Sky Notes

This month Hydra (Sea Serpent) which can be found low in the south-east below Leo. It is the largest of the 88 constellations, extending over a quarter of the night sky. Its stars are not particularly brilliant, the brightest, at magnitude 2, being Alphard (α Hydrai) – an orange giant, spec.type K 3II-III, 50x larger but only 3x the mass of our Sun and 117 light-years away. (RA 09h 27m  Dec -08° 39̕). Nearing the end of its life cycle, having shredded most of its hydrogen, it is likely to  become a white dwarf star.   The star chart also indicates Spica (α Virginis) one of the brightest stars in the sky. It is actually a close binary pair that rotates around each other in just 4 days. Due to this closeness and the gravitational interaction, their shapes are   more egg shaped than spherical. Star A is a blue giant variable  spec.type B1 III-V. Its companion is spec.type B2 V (RA 13 h 25m Dec -11° 09̕  ). They are 250 light-years away.

Forthcoming Meetings

5th June Stanboroughs Club 8:00 pm

Nik Szymanek

 

Hertford  Astronomy Group
 2019 Hertford Astronomy Group
Hertford  Astronomy Group
 2019 Hertford Astronomy Group