For you non-astronomers out there, realize that we do NOT see the planet in orbit around its star. That would be like finding a firefly circling a bank of floodlights.
Instead, astronomers carefully plot a star's movement (proper motion). If the star seems to wobble, that is carefully measured and the mass of the unseen object is inferred from the interplay between the two objects. Incidentally, the star's mass is determined the same way.
This process can take years of exacting, precise measurements and careful data interpretation. Don't want to forget to factor in Earth's own movement (yes, that did happen - embarrassing to all involved).
Stats for this star:
HD70642 --- RA 08:21:28 dec. -39:42:21 magnitude 7.17
RA is Right Ascension (longitude) and dec. is declination (latitude) projected onto the sky. Magnitude is apparent brightness. It is a logarithmic scale of brightness, with lower numbers being brighter. The dimmest naked-eye magnitude under excellent conditions varies according to visual acuity, but averages about magnitude 6.
I'll take this opportunity to show where the constellation Puppis (the Stern) is. If Canis Major is visible (Look for brilliant star Sirius) to the left of Orion, then Puppis is to the lower left of Canis Major.
The bright streak is an overexposed Sirius.