Fictional and Debunked Astronomical Bodies

These are proposed symbols for astronomical bodies that explicitly don't exist and never have. This includes some planets from various fictional sources, some of which could serve well as names for minor planets or exoplanets, but also bodies in our own Solar System which scientists, the public, or certain groups or individuals at one time or another. This also includes planets which are used in astrology, despite not actually existing. What purpose could symbols like these serve? I have no idea, but here they are.

Antichthon

In various science fiction stories and thought experiments, it is posited that there is a planet that orbits on the opposite side of the Earth from the Sun at all times. This planet is sometimes called Antichthon or Counter-Earth. Such a planet would indeed be concealed from direct observation from us, but it's gravitational influence on the other planets would be measurable, so its existence has been debunked.

Technically, such a thing could be physically possible, given the relative stability of L5 Lagrange points, but it may not be very likely or very stable over the long term, especially since long-term stability would require both planets have the same mass.

The symbol for this planet, if it had existed, would be a large circle with an "X" inscribed in it, essentially a 45 degree rotation of the symbol for Earth.

Caduceus
Flat Earth

Lilith (astrological)

Not to be confused with 1181 Lilith.

Also known in astrology as Black Moon Lilith [1]. This point corresponds to the second empty focus of the Moon's orbit around the Earth. Due to the mean precession of the major axis of the Moon, this point circles the Earth about every 8.85 years. The symbol for this astrological object is a black-filled crescent moon on a female cross, which exists in Unicode as ⚸, U+26B8.

For the astrologers who double as astronomy nerds, there is a "true" version of this object, which takes into account higher-order perturbations on the Moon's orbit by the Sun and planets. The symbol for this True Black Moon Lilith, as used in some astrology software, is a black-filled version of the symbol of [[[minor-planets:2 |2 Pallas].

Lilith (Earth satellite)

Not to be confused with 1181 Lilith.

Sometimes known in astrology as Dark Moon Lilith [1]. This is a secondary satellite of the Earth that was supposedly discovered by Georg Waltemath.

Proserpina

Neith

Not to be confused with 1122 Neith.

This is the name of a moon of Venus that was once thought to exist. In the end, it turns out that every supposed observation of this satellite was in fact either an optical illusion, or a mis-identified star. The perceived moon was named after the Egyptian goddess Neith, a complex figure who was associated with creation, war, and the universe.

The symbol for this nonexistent moon is as the symbol for 1122 Neith, two bows or arrows behind a shield, over Venus' cross.

Nemesis

Not to be confused with 128 Nemesis.

Phaëton

Not to be confused with 3200 Phaethon, which is real, or with Planet V, which is a more reasonable hypothesis.

This planet was hypothesized to have once orbited between the planets Mars and Jupiter. It was supposed to have broken up through some means, perhaps catastrophic tidal stresses or perhaps prehistoric nuclear apocalypse, leaving behind the asteroid belt. It is now known that the mass of the asteroid belt as a whole is less than that of any of the inner planets, and a more likely explanation is that Jupiter's gravitational influence prevented a planet from ever having formed there.

Selena (astrological)

Not to be confused with 1181 Lilith.

Also known in astrology as White Moon Selena [1]. This point travels in a way that opposed the astrological object Black Moon Lilith. Due to the mean precession of the major axis of the Moon, this point circles the Earth about every 8.85 years. The symbol for this astrological object is an unfilled crescent moon on a female cross.

For the astrologers who double as astronomy nerds, there is a "true" version of this object, which takes into account higher-order perturbations on the Moon's orbit by the Sun and planets. The symbol for True White Moon Selena, or True Light Moon Arta, as used in some astrology software, is a crescent moon rotated so the points are upward, on a female cross.

Transpluto

This is a fictional planet used in astrology [1]. It was predicted by astronomer Francis M.E. Sevin, during a time when many distant planets were being imagined. It's name comes from it's supposed orbital path being peyond Pluto. Although claims of observations of this planet have never been made, ephemerides for it exist in some astrological texts. This particular planet has also gone by the names Bacchus, [[[minor-planets:399 |Persephone, and Isis, each of which is of course already the name of a real asteroid.

There exists a common symbol for this astrological planet: a circle with an upward arc inscribed in the upper half of it, with an up arrow. The creator of this symbol is not known.

Tyche

Vulcan

This is a planet once thought to have existed within the orbit of Mercury. It was proposed by mathematician Urbain Le Verrier as a way to explain perihelion precession or Mercury's orbit. No definitive observations of this body have ever been made, and now Einstein's theory of general relativity explains Mercury's precession perfectly well.

The name of this hypothetical planet was chosen by Le Verrier after the Roman god of the forge and fire. His Greek counterpart is Hephaestus. The symbol for this planet is one that is not one I invented, but one I have seen around: a capital Latin letter V over a planetary cross.

[1] "Additional Symbols for Astrology, Revised," David Faulks, https://www.unicode.org/L2/L2016/16080r-add-astrology.pdf

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