HD209458 Compared to the Sun

 Parameter	Sun	HD209458	Source

 T (Kelvin)	5780	6000       
 Mv		4.79	4.29	Hipparcos.
 Log grav (cgs)	4.45	4.31	Blackwell et al, 1994, A&A 282, 899
 Spec. Type	G2V	F8V	SIMBAD
 R'hk		-4.937	-4.93	Keck/HIRES H&K line
 P rot (day)	25.4	~30+-10	from chromosph. K line (Noyes et al.)
 Vsini (Km/s)	1.8	3	Keck/HIRES Spectrum

 Age = 3-7 Gyr, from H&K line, and Noyes et al. (1984)

 (Data shamelessly cribbed from the Extra-Solar Planets Encyclopedia)