Exoplanet transit observation (Hong Kong) - HD189733_b

Astroandy

HD189733_b (RA 20:01 DEC 24:43)

quantity unit value 1-sigma uncertainty
Period days 2.2185733 0.0000019
Time of periastron HJD 2453988.8033600 0.0002300
Orbital eccentricity none 0.000 0.000
Argument of perihelion deg 90.000 0.000
Velocity half-amplitude m s^-1 205.000 6.000
Planetary mass M_Jup 1.154 ---
Stellar mass M_Sun 0.82 ---
Stellar T_eff Kelvin 5050  ---
Planetary T_eff Kelvin 1115  ---
Stellar Radius R_Sun 0.760 ---
Measured Planetary Radius R_Jupiter 1.156 ---
T_circ (w/o core) Gyr 0.057 ---
T_damp (w/o core) Gyr +Inf ---

Equipment:
Telescope: sc8
CCD: ATIK16HR 4x4 binned LPS2 filtered

Exposures:
3s with 17s intervals x 438 (spanning the whole transit window)

Data reduction:
IRIS

CHYeung

This is an excellent example of amateur "scientific " work.

What is the magnitude of the star?


YCH

Astroandy

It's mag 7.7.

Just verified that the 3 distinct peaks are all artifacts, the lost in magnitude is too high for a transit.

mca

Dear Astroandy

Thanks for sharing this good work, and it was done in HK!

Alan