Editing Aldebaran (section)

==Visual companions==
Five faint stars appear close to Aldebaran in the sky. These [[double star]] components were given upper-case [[Latin-script alphabet|Latin letter]] designations more or less in the order of their discovery, with the letter A reserved for the primary star. Some characteristics of these components, including their position relative to Aldebaran, are shown in the table.

{{Table alignment}}
{| class="wikitable sortable col5center" style="text-align: right;"
|+ WDS 04359+1631 catalogue entry<ref name=WDSC2014/>
! scope="col" | α&nbsp;Tau
! scope="col" data-sort-type=number | [[Apparent magnitude|Apparent<br />magnitude]]
! scope="col" data-sort-type=number | [[Angular separation|Angular<br />separation]] (″)
! scope="col" data-sort-type=number | [[Position angle|Position<br />angle]] (°)
! scope="col" | Year
! scope="col" data-sort-type=number | [[Parallax]] (mas)
|-
! scope="row" | B
| 13.60
| 31.60
| 113
| 2007
| {{val|47.2526|0.0964}}<ref name=Gaia3/>
|-
! scope="row" | C
| 11.30
| 129.50
| 32
| 2011
| {{val|19.1267|0.4274}}<ref name=dr2C/>
|-
! scope="row" | D
| 13.70
| {{n/a}}
| {{n/a}}
| {{n/a}}
| {{n/a}}
|-
! scope="row" | E
| 12.00
| 36.10
| 323
| 2000
|
|-
! scope="row" | F
| 13.60
| 255.70
| 121
| 2000
| {{val|0.1626|0.0369}}<ref name=dr2F/>
|}

Some surveys have indicated that Alpha Tauri B has about the same [[proper motion]] and [[parallax]] as Aldebaran and thus may be a [[binary star|physical binary]] system. These measurements are difficult, since the dim B component appears so close to the bright primary star, and the margin of error was historically too large to establish (or exclude) a physical relationship between the two.<ref name=poveda/> [[Gaia DR2]]<ref name=dr2B/> and [[Gaia DR3|DR3]]<ref name=Gaia3>{{Cite DR3|3313069881590622848}}</ref> support the physical association of Alpha Tauri B, and a 2019 survey lists it as a binary companion, with a physical separation of {{val|640|ul=au}}.<ref name="Mugrauer2019"/><ref>{{cite Exoplanet Archive|Alpha Tauri|acess-date=July 29, 2024}}</ref> A spectral type of M2.5 has been published for Alpha Tauri B.<ref name=bidelman/>

Alpha Tauri CD is a [[binary star|binary system]] with the C and D component stars gravitationally bound to and co-orbiting each other. These co-orbiting stars have been shown to be located far beyond Aldebaran and are members of the Hyades star cluster. As with the rest of the stars in the cluster they do not physically interact with Aldebaran in any way.<ref name=CD/>