AAVSO Alert Notice 575
April 28, 2017: Dr. Gregory Sivakoff (University of Alberta) has requested AAVSO observers' assistance in monitoring Swift J1357.2-0933 (CRTS J135716.8-093238) during its current outburst.
Dr. Sivakoff writes: "The black hole X-ray binary Swift J1357.2-0933 / CRTS J135716.8-093238 is in outburst. This is a rare black hole X-ray binary that is at high Galactic latitude. This means that extinction is relatively small and the bright blue nature of the outburst can be observed readily by citizen astronomers as the source fades into quiescence on a timescale of a few months. AAVSO observations will be critical in complementing multiple multi-wavelength campaigns observing this outburst. The combination of X-ray, UV, and optical light curves will be used to constrain the physics that explains why these sources go into outburst (the irradiated disk instability model). In addition, astronomers will be seeking to establish the flux of this source across the entire electromagnetic spectrum on a few occasions (for which we will request special coordination with AAVSO). This too will constrain theoretical models of accretion disks. In addition, this source is known to undergo recurring rapid dips. These dips can last for 10s of seconds, and recur on timescales of a few minutes. This is a great source for AAVSO observers, particularly CCD observers to follow."
From now until the object is no longer observable with your equipment (quiescence is r/i~20, V~22.3), UBV photometry is requested in the form of nightly snapshot observations (once to a few times per night). However, more frequent observations are also welcome. Dr. Sivakoff writes: "[The recurring rapid dips]...might be interesting for some observers to go after. These dips can be on the order of a minute long. Observers wishing to probe that should go for as fast observations as the telescope allows for them to get a SNR of ~10-20 in their telescope. To capture the longer term evolution, an hourly cadence would be wonderful, where people can get it."
Regarding priority of filters, he writes that "U B V places a priority on the blue filters, which are typically harder to get at higher Galactic extinction (lower Galactic latitude). That being said, I would definitely request that some observers get V data to connect with the daily SMARTS campaign (V I J K). As for other filters, "if people can get down to I ~ 17 - 18, then...Ic is good for connecting with the SMARTS campaign and LCOGT work on this source." The source may be too faint for Rc or unfiltered observations.
Precision of the photometry is requested to be at least 0.05 to 0.1 magnitude if possible, with allowance for it to go down to 0.2 mag as the source becomes fainter. A S/N of 10-20, and 5 at a minimum, is requested.
Coordinates for Swift J1357.2-0933 (CRTS J135716.8-093238) (2000):
RA 13 57 16.83 Dec -09 32 38.7
Charts: Charts with a comparison star sequence for Swift J1357.2-0933 (CRTS J135716.8-093238) may be created using the AAVSO Variable Star Plotter (VSP). Use either name to request the chart. To see the brighter end of the sequence, choose the 'f' scale (18.5 arcmin), and as the object becomes very faint, choose the 'g' scale (7.5 arcmin).
Submit observations: Please submit observations to the AAVSO International Database using the name SWIFT J1357.2-0933.
This campaign is being monitored on the AAVSO Observing Campaigns webpage and is being followed on the Campaigns and Observation Reports Forum at https://www.aavso.org/swift-j1357-observing-campaign.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO
Information on submitting observations to the AAVSO may be found at:
https://www.aavso.org/webobs
ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION
An Alert Notice archive is available at the following URL:
https://www.aavso.org/alert-notice-archive
Subscribing and Unsubscribing may be done at the following URL:
https://www.aavso.org/observation-notif ... ertnotices
-------------------------------------------------
Please support the AAVSO and its mission -- Join or donate today:
https://www.aavso.org/apps/donate/
Copyright © 2017 American Association of Variable Star Observers, All rights reserved.
You are receiving this email because you subscribed to the AAVSO Alert Notices. If you wish to unsubscribe, please go to your "My account" page on the AAVSO website and unclick the "Alert Notices" box under the "Email settings" tab. Thank you.
Our mailing address is:
American Association of Variable Star Observers
49 Bay State Rd.
Cambridge, MA 02138
AAVSO Alert Notice 575
Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
solar research, comet observation, astrometry, etc.
回覆文章
1 篇文章
• 第 1 頁 (共 1 頁)
回到「業餘天文研究專區 Amateur Astronomers' Research Area」
前往
- 天文 ASTRONOMY
- ↳ FAQ 天文
- ↳ 天文話題 Everything about Astronomy
- ↳ 天文攝影 Astrophotography
- ↳ 太陽觀測和攝影 Solar Observation & Photography
- ↳ 望遠鏡 廠制儀器 測試報告專欄 Telescope Testing Report Center
- ↳ 自製天文望遠鏡 Amateur Telescope Making
- ↳ 自製天文儀器 diy Astro Equipment
- ↳ 天文儀器维修中心
- ↳ 廠製儀器 Factory Equipment
- ↳ Raspberry Pi 自動導星裝置 diy Autoguiding
- ↳ 天文台 Observatory
- ↳ 香港搖控天文台 Hong Kong Remote Telescope
- ↳ 玉衡遙控天文台 Jade Scope Observatory
- ↳ 天文物理 Astrophysics
- ↳ 業餘天文研究專區 Amateur Astronomers' Research Area
- ↳ 天文圖像處理技巧 Astro Image Processing Technique
- ↳ 氣象地理 Weather & Geography
- ↳ 天文活動消息 Astro Activity News
- ↳ 論壇公佈
- 風馬牛
- ↳ 談天說地 Chatting Square
- ↳ 花鳥蟲魚 Natural World
- ↳ 太空科技 Space Technology
- ↳ 3D打印 新工藝技術 3D Printing New Technology
- ↳ 電腦資訊科技 Information Technology
- ↳ 旅遊天地 Travelling around the World
- ↳ 談股說金
- ↳ 網站支援 Technical Support
- 姊妹網站
- ↳ 黃隆網站 wonglung.com
- ↳ 天文家園
- 廠商專區 Telescope Suppliers'Area
- ↳ 香港天文儀器
- ↳ 香港遥控天文有限公司
- ↳ 南京英田
- ↳ 江西智通
- ↳ 開信 Kson
- ↳ 日昇儀器社
- ↳ 巨眼儀器社
- ↳ 觀星者天文儀器社
- ↳ 達氏望遠鏡
- ↳ 哈雷
- ↳ 振旺光電 ( 大眾天文 )
- ↳ 博冠望遠镜( 鵬城光學 )
- ↳ GRUS 天文社
- ↳ 多尼爾公司
- ↳ 括蒼天文
- ↳ 宇隆光電
- ↳ 二手交易場 Second Hand Area
- 天文教室
- ↳ diy 磨制牛頓反射鏡 --- 視頻
- ↳ 赤道儀的安裝--怎樣平衡望遠鏡
- ↳ 自制天文望遠鏡 Making Astronomical Telescope
- ↳ 天文攝影入門 Introduction to Astrophotography
- ↳ 天文數碼攝影入門 Digital Astrophotography ABC
- ↳ 天文觀測入門 Introduction to Astro Observation
- ↳ 月食的觀測 Lunar Eclipse Observation
- ↳ 日食的觀測 Solar Eclipse Observation
- ↳ 星星相識 Stars,Constellations & Telescopes ABC
- 會員專區 Members Only
- ↳ 下載區 Download Area
- 石硤尾官立小學;德明中學校友專區 Old Schoolmates' Area
- ↳ 石硤尾官立小學
- ↳ 德明中學
誰在線上
正在瀏覽這個版面的使用者:沒有註冊會員 和 7 位訪客