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protoplanet
ˈprotoplanet Astr. [f. proto- + planet n.1] A large diffuse body of matter in a solar or stellar orbit, postulated as a preliminary stage in the evolution of a planet.1949 Astrophysical Jrnl. CIX. 309 A simple model is therefore considered first, consisting of two spherical masses (‘protoplanets’) i...
Oxford English Dictionary
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Protoplanet
Another protoplanet, AB Aur b, may be in the earliest observed stage of formation for a gas giant. HD 169142 b additionally shows multiple lines of evidence to be a protoplanet.
wikipedia.org
en.wikipedia.org
Mesoplanet
See also
Asteroid
Centaur (minor planet)
Fusor (astronomy)
Protoplanet
Planetesimal
Brown dwarf
References
Isaac Asimov
Types of planet
Definition
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en.wikipedia.org
A 'Big Whack' Formed the Moon and Left Traces Deep in Earth, a Study ...
Nov 1, 2023The most popular theory says that about 4.5 billion years ago, a Mars-size protoplanet slammed into Earth. Some of the resulting debris, tossed into orbit, coalesced to form the moon. This idea ...
www.nytimes.com
Dawn - NASA Science
Dawn was the first spacecraft to orbit two extraterrestrial destinations - the protoplanet Vesta and the dwarf planet Ceres, both in the asteroid belt beyond Mars. Follow Dawn on its journey from Earth to the asteroid belt with this simulation built with real mission data. NASA/JPL-Caltech. Dawn Stories ...
science.nasa.gov
AB Aurigae b
AB Aurigae b (or AB Aur b) is a directly imaged protoplanet embedded within the protoplanetary disk of the young, Herbig AeBe star AB Aurigae. The discovery paper matches the protoplanet's emission using a composite model consisting of a 2000–2500 K thermal component responsible for the CHARIS
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en.wikipedia.org
HD 169142
Several protoplanet candidates have been suggested in the literature starting from 2014. This dust could be a circumplanetary disk or a dusty envelope around the protoplanet.
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HD 97048
the system a kink in the velocity of carbon monoxide gas (CO 3-2) as well as a gap in the dust emission of the disk are seen as evidence for a jovian protoplanet The protoplanet is located at 130 au from the star and has a mass of about 2.5 Jupiter masses.
wikipedia.org
en.wikipedia.org
Erg Chech 002
It is believed to be a fragment of a chondritic protoplanet that is over 4.566 billion years old, and is believed to be the oldest known volcanic rock
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HD 142527
The primary star belongs to the Herbig Ae/Be star class, while the companion, discovered in 2012, is a red dwarf star or accreting protoplanet with a projected
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en.wikipedia.org
قائمة أطول الجبال في المجموعة الشمسية
عام 1971، كان أطول جبل معروف في المجموعة الشمسية، وظل كذلك لمدة 40 عامًا، لكن في عام 2011 تم العثور على الذروة المركزية للحفرة Rheasilvia على الكويكب وprotoplanet
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ar.wikipedia.org
HD 100546
The star is surrounded by a circumstellar disk from a distance of 0.2 to 4 AU, and again from 13 AU out to a few hundred AU, with evidence for a protoplanet Planetary system
The HD 100546 system as a whole has one confirmed protoplanet candidate and there is evidence for 1–2 others, thus it is considered an
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en.wikipedia.org
Jane Greaves
While at the University of St Andrews she led the team which discovered a protoplanet within the protoplanetary disk around the young star HL Tauri.
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Erg Chech
These rocks represent bits of meteorite Erg Chech 002, the oldest pieces of volcanic rock ever found, likely from an ancient protoplanet.
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en.wikipedia.org
IM Lupi
The young star is suspected to host a still forming protoplanet at a distance of 110 astronomical units (AU) and a mass of 2-3 .
wikipedia.org
en.wikipedia.org