Fidonet Portal






From: Alan Ianson (1:153/757)
To: All
Date: Sat, 19.09.20 02:26
Daily APOD Report
Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our
fascinating universe is featured, along with a brief explanation
written by a professional astronomer.

2020 September 19

Orion in Depth
Illustration Credit & Copyright: Ronald Davison

Explanation: Orion is a familiar constellation. The apparent positions
of its stars in two dimensions create a well-known pattern on the bowl
of planet Earth's night sky. Orion may not look quite so familiar in
this 3D view though. The illustration reconstructs the relative
positions of Orion's bright stars, including data from the Hipparcus
catalog of parallax distances. The most distant star shown is Alnilam.
The middle one in the projected line of three that make up Orion's belt
when viewed from planet Earth, Alnilam is nearly 2,000 light-years
away, almost 3 times as far as fellow belt stars Alnitak and Mintaka.
Though Rigel and Betelgeuse apparently shine brighter in planet Earth's
sky, that makes more distant Alnilam intrinsically (in absolute
magnitude) the brightest of the familiar stars in Orion. In the
Hipparcus catalog, errors in measured parallaxes for Orion's stars can
translate in to distance errors of a 100 light-years or so.

Tomorrow's picture: breaking distant light
__________________________________________________________________

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC
& Michigan Tech. U.


--- MBSE BBS v1.0.7.18 (GNU/Linux-x86_64)
* Origin: The Rusty MailBox - Penticton, BC Canada (1:153/757)

ABOUT

This forum contains echomail areas hosted on Nightmare BBS You can browse local echomail areas, italian fidonet areas and a selection of international fidonet areas, reading messages posted by users in Nightmare BBS or even other BBSs all over the world. You can find file areas too (functional to fidonet technology). You can browse echomail areas and download files with no registration, but if you want to write messages in echomail areas, or use fidonet netmail (private messages with fidomet technology), you have to register. Only a minimal set of data is required, functional to echomail and netmail usage (name, password, email); a registration and login with facebook is provided too, to allow easy registration. If you won't follow rules (each echomail areas has its own, regularly posted in the echomail), your account may be suspended;

CONTACT