The brightest “star” over Mar del Plata tonight is not a star at all: it's Jupiter, about a third of the way up in the north-east before dawn. You can also see Venus, Mars and Saturn. It's dark enough for stars from about 20:38.
Rises into view in the east around 04:34 and stays until dawn washes it out. Best at 05:04: very low, just above the horizon in the east, one fist above the horizon. It stays low, so you need an open view with no buildings or trees in the way.
Rises into view in the east around 02:29 and stays until dawn washes it out. Best at 04:39: about a third of the way up in the north-east, 3 fists above the horizon.
Look north-east as the sky darkens. Visible until 03:34. Best at 22:09: about halfway up in the north, 5 fists above the horizon.
Rises into view in the north-east around 02:44 and stays until dawn washes it out. Best at 04:09: low in the sky in the north-east, 2 fists above the horizon.
Rises into view in the north-east around 22:29 and stays until dawn washes it out. Best at 01:44: about a third of the way up in the north, 3 fists above the horizon. You'll need binoculars or a small telescope and a dark sky.
Look north as the sky darkens. Visible until 02:24. Best at 21:44: about halfway up in the north, 5 fists above the horizon. You'll need binoculars or a small telescope and a dark sky.
Too close to the Sun to see right now. It is lost in the glare, 11° from the Sun.
Where to find them at 21:18, once the sky is dark.
It's most likely the planet Jupiter. It is about a third of the way up in the north-east and visible from 02:29 until dawn. Planets shine with a steady light, while stars twinkle.
Venus (from 04:34 until dawn), Mars (from 02:44 until dawn), Jupiter (from 02:29 until dawn) and Saturn (after sunset until 03:34). With binoculars or a telescope you can also find Uranus and Neptune.
The Sun sets at 19:34. The brighter stars and planets come out by 20:03, and the sky is properly dark from about 20:38. Full astronomical darkness begins at 21:16.
The Moon is a Waxing Crescent, 1% illuminated. Moonrise is at 05:54 and moonset at 20:20.
Calculated for Monday 9 November at 38.00°S, 57.58°W. Times are local to Mar del Plata.