Kvasar i udbrud

[lindhardDeltager Super Nova]

Kvasaren CTA 102 i Pegasus, som normalt er omkring mag 17.5, er i udbrud for tiden og nåede den 21. november et foreløbigt højdepunkt på 13.8, altså inden for rækkevidde af amatørteleskoperne.

CTA 102, eller 4C 11.69, som den også hedder, er 8 milliarder lysår væk og nok noget af det fjerneste, vi får at se.

Her er et par kort, som viser vejen til området.

Bemærk, syd er op på dette kort

AAVSO har detaljerede kort med magnitudeangivelser på de omkringliggende stjerner.

Edit: Oplysningerne kommer fra Sky and Telescope.

Lindhard2016-11-25 22:38:23

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mvh
Lars

[nightskyDeltager Neutron star]

En del indlæg og observationer her på forum omkring CTA 102. Har og er observeret af flere.

http://astro-forum.dk/forum_posts.asp?TID=9143&KW=CTA&PID=93359#93359

Fra 13 nov.

Blazar CTA 102 er uhyre interessant lige nu. En jeg har fulgt jævnligt
og som lige nu går helt amok over få timer.

http://www.astro-forum.dk/forum_posts.asp?TID=15330

AGILE ser forøget gamma stråling fra CTA 102

17 til 20 nov. store variationer over få timer 0,15 – 0,4 mag. 30 cm RC teleskop

Oppe omkring R~12,73
Mikro variabilitet 0,08 mag
Falder R=0,5 mag på 3,5 time
Midt november 0,9 mag ændring
0,4 m teleskop

8. nov.
Rapport om kraftigste (8. nov) optiske maksimum i mere end 40 års observationer.

Samler selv jævnligt data på den.

Nightsky2016-11-25 23:58:13

[lindhardDeltager Super Nova]

CTA 102 er stadig i gang:

BLAZAR CTA 102 = 4C 11.69

Elizabeth Waagen, reports on AAVSO Special Notice 426, that the

blazar CTA 102 (4C 11.69) has been in an active state in gamma-ray and

optical wavelengths since 2015. During 2016, it has had numerous flaring

episodes, particularly since late October. It is presently in an

unprecedentedly bright optical state, and showing substantially increased

emission in gamma-ray and near-infrared wavelengths.

To quote T. Balonek (Colgate University) et al. (ATel #9808): “The blazar

CTA 102 continues its amazing intra-day optical flaring activity during a

prolonged outburst, reaching the unparalleled optical brightness of R ~

11.85 on 2016 November 30 (UT). This is one-and-a-half magnitudes brighter

than observed during any outburst prior to 2016 November, more than

three-quarters magnitude brighter than the blazar’s previous reported

brightness record on 2016 November 13 (ATel #9756), and five magnitudes

brighter than the blazar’s quiescent level (around R ~ 17.0).

“On 2016 November 30 at 3 UT (JD 2457722.63), preliminary reductions show

CTA 102 at R ~ 12.05. During the next hour, the blazar brightened by 0.2

magnitudes to R ~ 11.85 at 4 UT (JD 2457722.67).”

Observations in the AAVSO International Database (AID) from later on

November 30 (Nov. 30.72487 UT) showed CTA 102 at R = 12.673 +/-0.004, Nov.

30.72400 at B = 13.428 +/-0.008, and Nov. 30.72313 at V = 12.935 +/-0.005

(DUBF, F. Dubois, Zillebeke, Belgium). The most recent observations in the

AID show it on 2016 December 1.66869 UT at magnitude V = 12.023 +/-0.020 and

on Dec. 1.67044 at R = 11.712

+/-0.073 (WTHB, T. Wikander, Borlange, Sweden).

Observations in all bands including visual welcomed. Changes of a few tenths

of a magnitude over a period of a few hours have been observed. Thus,

CCD/DSLR observations should be closely spaced.

Coordinates (2000.0): R.A. 22 32 36.41 Dec. +11 43 50.9

Charts: Charts with a comparison star sequence for CTA 102 may be created

using the AAVSO Variable Star Plotter (VSP) at

https://www.aavso.org/vsp.

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mvh
Lars

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