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AAVSO Bulletin 78 - Stars with Double Maxima

In AAVSO Bulletin 78 there are two stars that exhibit double maxima:  R Cen and R Nor. These stars therefore have primary and secondary maxima and minima. They are not included in the main Bulletin table. Their predicted dates of maximum and minimum for January 2015 through February 2016 are presented here in list form (JD and Gregorian calendar dates) and in approximation of the main Bulletin table format.

V Boo, a semiregular, has intermittently demonstrated double maxima behavior for a number of years. In 2014 it became too irregular to predict maxima and minima accurately.  Thus, it has been omitted from AAVSO Bulletin 78. However, observations of V Boo are strongly encouraged, and with an approximate magnitude range of 7-11, it is accessible to many sizes of binoculars and telescopes.

In the information below, 'I' indicates a primary extremum and 'II' a secondary. For example, MAX(I) in the list and MAX(29-I) in the table both mean a primary maximum, in this case on the 29th of the month in which the date appears. Dates are for 2015 except where indicated 2016.

R CEN   P = 512 (revised from 2014)
2457111 MAR 29 MAX(I)
2457273 SEP 7 min(I)
2457343 NOV 16 MAX(II)

R NOR   P =  507.5
2457125 APR 12 MAX(I)
2457205 JUL 1 min(I)
2457286 SEP 20 MAX(II)

 

In the table below, the following fields are given:
Name: name of variable star
Links:
 L - to the AAVSO Light Curve Generator
 X - to the International Variable Star Index (VSX)
 T - to the AAVSO table of published maxima/minima of long period variables
R.A. and Declination: coordinates in J2000.0
Period: in days
Range: average visual magnitude range based on data in the AAVSO International Database
N: number of observations in the AAVSO International Database received during calendar year 2014
JAN-DEC-FEB: January-December 2015, January-February 2016

The number in a given month indicates the date of extremum; MAX indicates Maximum and 
min indicates minimum.  The colors indicate (as chosen by the user) the intervals when 
the star will be brighter than visual magnitude 11.0 or fainter than magnitude 13.5.

Bulletin 78 Maxima and Minima for R Cen and R Nor January 2015-February 2016
NAME   L X T R.A.             DECLINATION PERIOD RANGE N JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB
R CEN L X T 14 16 34.32 -59 54 49.3 512 <5.8-11.1> 250 rising rising MAX(29-I) fading fading fading fading fading min(7-I) rising MAX(16-II) fading fading fading
R NOR L X T 15 35 57.35 -49 30 28.7 507.5 <7.2-13.2> 60 rising rising rising MAX(12-I) fading fading min(1-I) rising MAX(20-II) fading fading fading fading fading
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