Question

Using the source of your choice - Simbad, Stellarium, or some other reasonably reliable source - choose the hottest star:

		Naos
		Miaplacidus
		Regor
		Avior
		Season-2 of New Girl era Zooey Deschanel

Answer 1

Naos (Suhail Hadar)
ζ Pup - HIP 39429 - SAO 198752 - HD 66811 - HR 3165
Type: variable star (ACYG:)
Magnitude: 2.20 (extincted to: 3.54)
Absolute Magnitude: -5.41
Color Index (B-V): -0.28
Magnitude range: 2.11÷2.17 (Photometric system: Hp)
RA/Dec (J2000.0): 8h03m35.01s/-40°00'11.0"
RA/Dec (on date): 8h04m14.09s/-40°03'25.9"
HA/Dec: 21h42m13.11s/-39°54'39.5" (apparent)
Az./Alt.: +154°10'55.9"/+4°59'53.9" (apparent)
Gal. long./lat.: -104°01'27.4"/-4°42'20.7"
Supergal. long./lat.: +178°13'33.7"/-61°29'04.7"
Ecl. long./lat. (J2000.0): +138°33'01.5"/-58°20'51.7"
Ecl. long./lat. (on date): +138°48'16.7"/-58°20'46.6"
Ecliptic obliquity (on date): +23°26'07.1"
Mean Sidereal Time: 5h46m5.4s
Apparent Sidereal Time: 5h46m4.7s
IAU Constellation: Pup
Distance: 1083.58 ly
Spectral Type: O6/7III
Parallax: 0.00301"
Proper motions by axes: -31.2 16.7 (mas/yr)
Position angle of the proper motion: 298.2°
Angular speed of the proper motion: 35.4 (mas/yr)

Miaplacidus
β Car - HIP 45238 - SAO 250495 - HD 80007 - HR 3685
Type: star
Magnitude: 1.65 (extincted to: 2.01)
Absolute Magnitude: -1.05
Color Index (B-V): 0.07
RA/Dec (J2000.0): 9h13m11.30s/-69°43'02.6"
RA/Dec (on date): 9h13m24.36s/-69°47'42.2"
HA/Dec: 20h32m40.31s/-69°47'42.2" (apparent)
Az./Alt.: +162°32'24.2"/-25°10'31.2" (apparent)
Gal. long./lat.: -74°01'19.7"/-14°24'29.5"
Supergal. long./lat.: -166°56'26.1"/-31°55'36.2"
Ecl. long./lat. (J2000.0): +211°58'07.3"/-72°14'13.3"
Ecl. long./lat. (on date): +212°13'12.3"/-72°14'18.4"
Ecliptic obliquity (on date): +23°26'07.1"
Mean Sidereal Time: 5h46m5.4s
Apparent Sidereal Time: 5h46m4.7s
IAU Constellation: Car
Distance: 113.17 ly
Spectral Type: A1III-
Parallax: 0.02882"
Proper motions by axes: -179.0 120.9 (mas/yr)
Position angle of the proper motion: 304.0°
Angular speed of the proper motion: 216.0 (mas/yr)

Regor (Suhail al Muhlif)
γ Vel - γ2 Vel - HIP 39953 - SAO 219504 - HD 68273 - HR 3207 - WDS J08095-4720Aa,Ab
Type: double star
Magnitude: 1.75 (extincted to: 9.78)
Absolute Magnitude: -5.92
Color Index (B-V): -0.15
RA/Dec (J2000.0): 8h09m31.95s/-47°20'11.5"
RA/Dec (on date): 8h10m06.26s/-47°23'34.5"
HA/Dec: 21h37m53.19s/-46°45'14.5" (apparent)
Az./Alt.: +156°31'48.4"/-1°28'41.2" (apparent)
Gal. long./lat.: -97°11'51.0"/-7°41'08.9"
Supergal. long./lat.: -175°37'00.1"/-54°48'53.5"
Ecl. long./lat. (J2000.0): +147°20'58.1"/-64°27'50.9"
Ecl. long./lat. (on date): +147°36'08.5"/-64°27'46.9"
Ecliptic obliquity (on date): +23°26'07.1"
Mean Sidereal Time: 5h46m5.4s
Apparent Sidereal Time: 5h46m4.7s
IAU Constellation: Vel
Distance: 1116.97 ly
Spectral Type: WC 8
Parallax: 0.00292"
Position angle (1997): 13.00°
Separation (1997): 4.720"
Proper motions by axes: -6.1 11.2 (mas/yr)
Position angle of the proper motion: 331.4°
Angular speed of the proper motion: 12.8 (mas/yr)

Avior
ε Car - HIP 41037 A - SAO 235932 - HD 71129 - HR 3307 - WDS J08225-5931
Type: double star
Magnitude: 2.15 (extincted to: 2.89)
Absolute Magnitude: -4.29
Color Index (B-V): 0.82
RA/Dec (J2000.0): 8h22m30.76s/-59°30'34.1"
RA/Dec (on date): 8h22m53.79s/-59°34'14.0"
HA/Dec: 21h23m10.88s/-59°34'14.0" (apparent)
Az./Alt.: +160°45'11.1"/-13°47'18.3" (apparent)
Gal. long./lat.: -85°42'52.7"/-12°36'04.0"
Supergal. long./lat.: -168°37'13.2"/-43°21'38.4"
Ecl. long./lat. (J2000.0): +173°07'43.4"/-72°40'48.1"
Ecl. long./lat. (on date): +173°22'42.3"/-72°40'47.8"
Ecliptic obliquity (on date): +23°26'07.1"
Mean Sidereal Time: 5h46m5.4s
Apparent Sidereal Time: 5h46m4.7s
IAU Constellation: Car
Distance: 632.09 ly
Spectral Type: K3: III + B2: V
Parallax: 0.00516"
Position angle (2015): 145.00°
Separation (2015): 0.461"
Proper motions by axes: -28.6 23.3 (mas/yr)
Position angle of the proper motion: 309.2°
Angular speed of the proper motion: 36.9 (mas/yr)

Hottest is Naos.