[4] HH 30 was published by George Herbig in 1974 in the "Draft Catalog of Herbig–Haro Objects" and notes: "HH-30 (4h 28m 44s) is a small, almost stellar spot 2' south of XZ and HL Tau.

The small fuzzy spot of very similar appearance at 35" in 250° from HL Tau is not a HH Object, but a star having Hα in emission.

[8][5] One study suggest that the central object is a binary star, due to the jet wiggling.

[3] Observations with the Plateau de Bure interferometer detected the carbon monoxide (CO) emission and measured the rotation of the disk.

[8] Observations with the Atacama Large Millimeter Array (ALMA) showed the mid-plane of the disk in 13CO and also measured its rotation.

[12] Early observations with Hubble showed that the knots of the jet have a speed of 100 to 300 km/s.

The jet is bright in the MIRI F1280W filter, likely tracing ionized neon emission.

[2] The jet is seen with NIRSpec in ionized iron with a tight semi-opening angle of 1.4°±0.9°.