690 Wratislavia

Picture of the Day · NASA

PK 164 +31.1: The Headphone Nebula

2026-05-27

What is a pair of headphones doing in the sky? Today’s image features the Headphone Nebula, also known as PK 164 +31.1 or Jones-Emberson 1. This planetary nebula, the remnant of a dying Sun-like star, faintly occupies an angular region of the Lynx constellation about 1/5th the diameter of the full moon. The red and blue-ish green colors trace hydrogen and oxygen atoms, respectively, that have been excited and ionized by the nebula's central white dwarf. The headphone shape, where two lobes of hydrogen puncture the inner region of oxygen, adds this object to a long list of oddly shaped nebulae. The morphology of such strange nebulae hint at the presence of a stellar or planetary companion, which can stir the material flowing out from the dying star. You can listen to Hubble and JWST sonifications of planetary nebulae through your very own headphones!

via NASA APOD

Key facts

Discovered by

Joel Hastings Metcalf

Discovery site

Taunton, Massachusetts

Discovery date

16 October 1909

Pronunciation

/ v r æ t ɪ ˈ s l ɑː v i ə /

Named after

Wrocław

Alternative designations

1909 HZ

Observation arc

113.75 yr (41547 d)

Aphelion

3.7163 AU (555.95 Gm )

Perihelion

2.5737 AU (385.02 Gm)

Semi major axis

3.1450 AU (470.49 Gm)

Orbital period sidereal

5.58 yr (2037.2 d )

Mean anomaly

53.487 °

Mean motion

0° 10 36.192 / day

Wikidata facts

Instance of

asteroid

Followed by

Q156534

Follows

Q117317

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

+134.65

Orbital period

+2044.435786769584

Image

690Wrat-mag13-100yrs.jpg