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Celestial objects to observe in July 2025 2025년 7월의 천체 관측 대상들 Celestial objects to observe in July 2025. 2025년 7월의 천체 관측 대상들. Large photo: https://cometsky.com/astronews/2025_07_july_skyobject_large_bsyeom.jpgBum-Suk Yeom. 염범석. 2025. 7. 7.
Nightsky brightness measured with SQM-L in the Govi Desert 고비 사막에서 SQM-L로 측정한 밤하늘 밝기 Night sky brightness measured with SQM-L (Sky Quality Meter with Lens) equipment in the Govi Desert. Because the night sky was cloudy, the measurement was darker than the actual brightness, 22.14 mag/arcsec^2, but when the weather was clear a few days later, the measurement was approximately 21.7 mag/arcsec^2. I think this value is probably correct. Based on the Bottle Scale, Bottle Class 1 corr.. 2025. 7. 3.
V462 Lup, Naked-eye Nova in the constellation Lupus V462 Lup (AT 2025nlr, ASASSN-25cm, and N Lup 2025). Naked-eye Nova in Lupus. 직각자자리에 나타난 맨눈으로 관측 가능한 신성, V462 Lup. 국내에서는 고도가 낮아서 맨눈으로 관측은 어렵고 쌍안경을 사용해야 볼 수 있을 것 같습니다. 사진은 예전에 찍은 것이라 신성이 나타나 있지 않습니다. 현재 신성의 밝기는 5.5등급입니다. Large photo: https://cometsky.com/astronews/astronews_20250619_bsyeom.jpgBum-Suk Yeom. 염범석. 2025. 6. 19.
Celestial objects to observe in June 2025 2025년 6월의 천체 관측 대상들 Celestial objects to observe in June 2025. 2025년 6월의 천체 관측 대상들. Large photo: https://cometsky.com/astronews/2025_06_june_skyobject_large_bsyeom.jpgBum-Suk Yeom. 염범석. 2025. 6. 2.
Summer constellations 여름철의 주요 별자리 Summer constellations. 여름철의 주요 별자리. https://cometsky.com/astronews/summer_skymap_01_large_bsyeom.jpg https://cometsky.com/astronews/summer_skymap_02_large_bsyeom.jpg 염범석. Bum-Suk Yeom. 2025. 6. 1.
Naked-Eye Giant Sunspot Returns 맨눈으로 관측 가능한 거대한 태양 흑점의 귀환 Naked-Eye Giant Sunspot Returns (using Solar Glasses). (태양 안경을 사용하여) 맨눈으로 관측 가능한 거대한 태양 흑점의 귀환. Large photo: https://cometsky.com/astronews/sun_20250526_sdo_bsyeom.jpgThe biggest sunspot of 2025 is coming back. After a two week transit around the farside of the sun, sunspot 4079 returns to transit the solar disk. The sunspot is currently five times the size of Earth. (Caution) .. 2025. 5. 26.
Naked-Eye Giant Sunspot 맨눈으로 관측 가능한 큰 태양 흑점 Naked-Eye Giant Sunspot using Solar Glasses (or Solar Filter). 태양 안경을 사용하여 맨눈으로 관측 가능한 큰 태양 흑점. Large photo: https://cometsky.com/astronews/sun_20250503_sdo_bsyeom.jpghttps://cometsky.com/astronews/sun_20250503_sdo_en_bsyeom.jpg A giant sunspot, visible to the naked eye, is crossing the sun's disk. I could see the sunspot clearly with the solar glasses. This sunspot is eight times.. 2025. 5. 3.
Naked-Eye Giant Sunspot using Solar Glasses (or Solar Filter) 태양 안경을 사용하여 맨눈으로 관측 가능한 큰 태양 흑점 Naked-Eye Giant Sunspot using Solar Glasses (or Solar Filter). 태양 안경을 사용하여 맨눈으로 관측 가능한 큰 태양 흑점. Large photo: https://cometsky.com/astronews/sun_20250502_sdo_bsyeom.jpgA giant sunspot, visible to the naked eye, is crossing the sun's disk. This sunspot is six times the size of Earth. (Caution) You must use Solar glasses or Solar filters to protect your eyes. 육안으로 볼 수 있는 거대한 흑점이.. 2025. 5. 2.
Celestial objects to observe in May 2025 2025년 5월의 천체 관측 대상들 Celestial objects to observe in May 2025. 2025년 5월의 천체 관측 대상들. Large photo: https://cometsky.com/astronews/2025_05_may_skyobject_large_bsyeom.jpgBum-Suk Yeom. 염범석. 2025. 4. 30.
SOLAR MINIMUM (2019) & SOLAR MAXIMUM (2024) 태양 활동 극소기(2019년)와 극대기(2024년) SOLAR MINIMUM (2019) & SOLAR MAXIMUM (2024).   태양 활동 극소기(2019년)와 극대기(2024년).     Large image: http://cometsky.com/astronews/solar_min_max_2019_2024_bsyeom.jpg  https://www.swpc.noaa.gov/products/solar-cycle-progression?fbclid=IwY2xjawJZ6illeHRuA2FlbQIxMAABHWpdRV7R93QVftTd6f1PX7Ewa-K1ulFGExCJNZezodx1idacFdpTXTL9aQ_aem_aClNaTNHRMeoomt-FxcfqQ Taken by Bum-Suk Yeom. 염범석. Solar activity appears to be.. 2025. 4. 3.
Spring constellations 봄철의 주요 별자리 Spring constellations. 봄철의 주요 별자리.   염범석. Bum-Suk Yeom.   Large size:  http://cometsky.com/astronews/spring_skymap_bw_bsyeom.jpg 2025. 4. 2.
Celestial objects to observe in April 2025 2025년 4월의 천체 관측 대상들 Celestial objects to observe in April 2025.     2025년 4월의 천체 관측 대상들.        Large photo:     https://cometsky.com/astronews/2025_04_apr_skyobject_large_bsyeom.jpg  Bum-Suk Yeom. 염범석. 2025. 4. 2.