thumb|Photograph of Telescopium Herschelii with constellations Gemini, Auriga, Perseus and the [[Pleiades]]
thumb|right|Telescopium Herschelii on a [[celestial globe at the Herschel Museum of Astronomy, Bath]]
thumb|right|Artistic rendering of Telescopium Herschelii.
thumb|Illustrated in [[Urania's Mirror (1825), next to Lynx]]
Telescopium Herschelii (Latin for Herschel's telescope), also formerly known as Tubus Hershelli Major, is a former constellation in the northern celestial hemisphere. Maximilian Hell established it in 1789 to honour Sir William Herschel's discovery of the planet Uranus. It fell out of use by the end of the 19th century. ψ<sup>2</sup> Aurigae at apparent magnitude 4.79 was the constellation's brightest star.
Stars
ψ<sup>2</sup> Aurigae (also known as 50 Aurigae), with an apparent magnitude of 4.8, was the brightest star in the constellation, Bode assigning it the designation 'a'. Located 420 ± 20 light-years distant from Earth, it is an orange giant of spectral type K3III. Other stars belonging to the constellation include ψ<sup>4</sup>, ψ<sup>5</sup>, ψ<sup>7</sup>, ψ<sup>8</sup>, ψ<sup>9</sup>, 63, 64, 65 and 66 Aurigae, and o Geminorum.
Thought to be around 4 billion years old, ψ<sup>5</sup> Aurigae is a sunlike star of spectral type G0V that is around 1.07 times as massive as the Sun and 1.18 times as wide. It appears to have a circumstellar disk of dust, known as a debris disk.
Bode also gave them Bayer designations from a to p, also adding an uppercase B, although after the constellation was declared obsolete they were disused.
Here is a table of stars with the corresponding Bayer designations.
{| class="wikitable sortable sticky-header"
|-
! Name
! B
|-
| ψ<sup>2 </sup>Aur
| a
|-
| ψ<sup>4 </sup>Aur
| b
|-
| ψ<sup>7 </sup>Aur
| c
|-
| 63 Aur
| d
|-
| 64 Aur
| e
|-
| 65 Aur
| f
|-
| 66 Aur
| g
|-
| HIP 35623
| h
|-
| HIP 37946
|i
|-
| HIP 35113
| k
|-
| ψ<sup>5</sup>Aur
| l
|-
| 47 Aur
| m
|-
| HIP 35265
| n
|-
| Jishui
| o
|-
| 60 Aur
| p<sup>1</sup>
|-
| 59 Aur
| p<sup>2</sup>
|-
| HIP 34267
| B
|}
See also
- List of stars in Telescopium Herschelii
- Telescopium
- Former constellations