Skip to main content

DY Vul

ret45's picture
ret45
Offline
Joined: 2012-01-25

Hello,

a newbie question about DY Vul: what does "p" magnitude code means? 

I ask this because the chart (8643KO) says  Magn. 8.4-9.7p , but my observations, and even the light curve from LPG, shows higher magnitudes than 8.4 so I wondered why. Maybe because these mags are not v ?

thanks

Massimo (BGMB)

 

 

What Does "p" Stand For?
BRJ's picture
BRJ
Offline
Joined: 2010-07-24

Massimo - When a "p" follows the listed magnitude range of a variable on one of our charts (or in any catalog) it indicates the variable's range as photographic, which is decidedly bluer than in visual light. Thus, if the variable is a reddish star, like Mira types, SR, or many irregulars are, the visual range will be brighter than that indicated by the "p" range.

J.Bortle  (BRJ)

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484