Asteroid Huenna occults star on 23 April.

Asteroid Huenna occults TYC 1359-01468-1 on April 23 at 21h 55m to 22h 2m UT.

Timing can be visual with stop watch. Allow 1/2 sec human responce time to start stop watch and visa versa. The idea is to obtain a better position and diameter of the asteroid in question.

Star Mv = 11.8

RA = 7 20 46.613
Dec = 20 56 48.00
Max duration = 4.1 secs
Mag drop = 3.5
Sun: Dist = 75 deg
Moon: Dist = 99 deg

Asteroid:
Mag = 15.3
Dia = 92 km

A central path from Dublin to Tullamore, Athlone, Roscommon, Belmullet (Co. Mayo)

A wide path with limits starting from Louth to South Wicklow then finally onto Sligo to South Mayo.

Clear skies

Eamonn Ansbro

Asteroid Huenna occults TYC 1359-01468-1 on April 23 at 21h 55m to 22h 2m UT.

7 minutes for an occultation, thats quite a long time isn't it? :shock: Would have normally thought 2 or 3 minutes would be the norm for an obscure asteroid. Lets hope the weather would play its part.

I presume Eamonn, even a small 70mm refractor would be able to detect this, as its the drop and reappearance in brightness of the star that are the indicators needed for the measurements? Not a hope of such an instrument getting the asteroid!

Seanie.

Eamonn - is there a requirement for photometric data or are you just looking for timings?

Dave McD

Asteroid Huenna occults TYC 1359-01468-1 on April 23 at 21h 55m to 22h 2m UT.

7 minutes for an occultation, thats quite a long time isn't it? :shock:

I think the 7 minutes is the amount of time between when the occultation starts and ends anywhere on the earth's surface. From the one location, the figure
Max duration = 4.1 secs that Eamonn quotes probably applies.

Asteroid Huenna occults TYC 1359-01468-1 on April 23 at 21h 55m to 22h 2m UT.

7 minutes for an occultation, thats quite a long time isn't it? :shock:

I think the 7 minutes is the amount of time between when the occultation starts and ends anywhere on the earth's surface. From the one location, the figure
Max duration = 4.1 secs that Eamonn quotes probably applies.

Ah yes, I see what you mean! Now that I read it properly (focus Seanie, focus...), it makes sense!

Thanks Colin!