香港天文論壇

Images in H-alpha

2021 February 26 Sun - prominences on the SW solar limb The huge prominence here is from the huge dark filament that comes off-disc. Sunspot count: group=1, sunspots=7, R=17 For H-alpha images: Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow Camera : ASI174MM exposure: 30.0 ms For Ca-K ...

2021 February 26 Sun - prominences on the NE solar limb

No Ca-K images due to clouds.
Sunspot count: group=1, sunspots=7, R=17

For H-alpha images:
Telescope: Lunt LS50T with B1200 blocking filter + 2X barlow
Camera : ASI174MM
exposure: 20.0 ms
approximately north is up, east to the left

2021 February 26 Sun - solar surface in H-alpha, with AR12803, AR12804 and AR12805 AR12803 and AR12805 are not too active today, although plages and filaments are plentiful. AR12804 is very active, with bright plages and micro flares. The sunspots are also prominent. A dark filament originating from...

2021 February 26 Sun - solar surface in Ca-K, with AR12803, AR12804 and AR12805 AR12803 and AR12805 are less active today. Bright plages are visible, but no trace of sunspot. AR12804 remains very active with lots of bright plages. The leading and following sunspots of this Class-D group are clearly ...

2021 February 26 Sun - AR12803, AR12804 and AR12805 Activities in AR12803 and AR12805 have tuned down a lot. No sunspot is visible in these 2 AR's. AR12804 remains vary active. The sunspots have evolved into Class-D, where both the leading and following sunspots have developed penumbrae. At least 7 ...

AAVSO Webinar

Date: 2021 February 27
Time: 19:00 UT

Speaker: Dr. Luisa Rebull
Title: "Stellar Rotation in Young Clusters using K2 and TESS"
Speaker: Dr. Margarita Karovska
Title: "Why is it important to observe/monitor LPVs?"

https://www.aavso.org/2021-webinars

2021 February 25 Sun - AR12803, AR12804, AR12805 and possible AR12806 The solar disc has undergone violent changes in the past 24 hours. While AR12803 and AR12805 are relative quiet, AR12804 has produced bright flares and active filaments. Many sunspots are visible in this Class-D group. Meanwhile, ...

2021 February 24 - Squirrels near Kornhill exit

This squirrel is spotted near the Kornhill exit of the trail.

Pigs of the 2nd family, near Kornhill

2021 February 24 - 2 families of wild pigs, on a slope down Mt. Parker Road and the trail to Kornhill

2021 February 24 - Birds, along Mt. Parker Road and the trail to Kornhill (3)

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2021 February 24 - Birds, along Mt. Parker Road and the trail to Kornhill (2)

2021 February 24 - Birds, along Mt. Parker Road and the trail to Kornhill (1)