2009 YG19

[pberrett]

Hi all

I have been following the thread about 2009 YE7 with some interest and noting how from the brightness of an object found one could estimate its diameter.

As a result I have been going to the minor planet center and following on a daily basis the discovery of new objects.

http://www.cfa.harvard.edu/iau/lists/LastUnusual.html

I note that a TNO is recently listed called 2009 YG19 but can't find any details about its brightness (H). First when I see a new object like this appear where can i get this information ie about its brightness? Second how can I easily convert the H into an estimated diamater?

Finally to 2009 TG19 itself. How big do you think it is?

cheers Peter

 

[MeteorWayne]

Here's the JPL Small Body Database Browser:

http://ssd.jpl.nasa.gov/sbdb.cgi

Just type in 2009 YG19 into the search window and hit return. You will find that the "H" (Apparent magnitude) for this object is 6.0

It also tells you this is a Scattered disc object, Wayyyy out there with perihelion of 33 AU an aphelion of 102 AU, semimajor axis 68 AU. You should note that with only 12 observations over a 12 day arc, for such a distant object the orbital parameters will probably change quite a bit, as well as possibly the H as more data comes in. This should be considered VERY preliminary.

For converting H to estimated diameter, see http://neo.jpl.nasa.gov/glossary/h.html

 

[pberrett]

Thanks for that

So H = 6 = 170km-380km. A bit smaller than I had hoped but big enough for a few golf courses I suppose.

I'll keep hoping for a 0.1 magnitude or brighter object

cheers Peter