Latest news with #CharlesKowal
SBS Australia
2 days ago
- Science
- SBS Australia
Move over Mercury: What is Chiron, and what does it mean to be in retrograde?
You might have seen an interesting phrase popping up in your social media feeds lately: "Chiron is in retrograde." If you're anything like me, you've never heard of Chiron before — and I'm a professional astronomer. So what is Chiron, and what does it mean to be in retrograde? The short answer is that Chiron is an asteroid-slash-comet orbiting somewhere past Jupiter and Saturn. And until January 2026, it's going to look like it's going backwards in the sky. If you can spot it. But there's a bit more to the story. What is Chiron? Chiron's official name is (2060) Chiron. First things first: it's pronounced "kai-ruhn", with a hard K sound. It was discovered by astronomer Charles Kowal in 1977. This was long after the system of Western astrology was developed, which probably explains why people who check their daily horoscopes are also blissfully unaware of its existence. It was initially classified as an asteroid, or a rock in space. In 1989 astronomers discovered Chiron sometimes has a tail or "coma", which tells us that it's actually a comet or a "dirty snowball". Since then, Chiron has been classified as both an asteroid and a comet. A Hubble Space Telescope image of Chiron shows its fuzzy coma. Source: The Conversation / Hubble Space Telescope In 2023, more than 45 years after it was first discovered, astronomers confirmed that Chiron has rings. This makes it the fourth non-planet in the Solar System to have rings. (The planets Jupiter, Saturn, Uranus and Neptune have rings, as do the asteroid Chariklo and the dwarf planets Haumea and Quaoar.) Chiron orbits the Sun in an oval-shaped orbit. The closest it gets to the Sun is about 1.3 billion kilometres (about eight times the distance between Earth and the Sun) and the furthest it gets from the Sun is a whopping 2.7 billion km (about 19 times the distance between Earth and the Sun). This puts it between the orbits of Jupiter and Uranus, cutting through the orbit of Saturn. Centaurs in space Chiron is a member of the Centaurs. This is a group of small solar system bodies that orbit the Sun between Jupiter and Neptune. Their orbits are highly unstable: they change over time because of gravitational interactions with the giant planets. In Greek mythology, centaurs were creatures with the lower body and legs of a horse and the torso and arms of a human. Chiron was the oldest centaur, the son of the Titan Kronos. He was considered the wisest centaur. Fans of Percy Jackson and the Olympians may also recognise Chiron as the director of Camp Halfblood. The orbits of various centaurs, including Chiron. Source: The Conversation / Nick Anthony Fiorenza Chiron in retrograde In astronomy, retrograde motion is when something is going backwards compared with everything else. Apparent retrograde motion is where an object in the sky, such as a planet, appears to be going backwards when we look at it from Earth. The object hasn't actually changed direction; it just looks like it from our perspective. All the planets (and Chiron) orbit the Sun in the same direction. This means the planets typically look like they are moving in a west-to-east direction across the sky. But when Earth "catches" up to a planet (or a planet catches up to Earth) and overtakes it, the planet temporarily appears to move in a west-to-east direction in the sky. This temporary illusion is apparent retrograde motion. It's just like when you're driving in a car and overtake a slower car, that slower car looks like it's going backwards as you overtake it. Chiron went into retrograde (that is, apparent retrograde motion) on 30 July 2025, and will go back to normal on 2 January 2026. But unless you have a telescope or do some long-exposure photography, you'd never know which way Chiron is travelling. Chiron is very faint, so you can't see it with your eyes. The ancient astrologers didn't know about Chiron, but I like to think they'd appreciate a centaur in space with a ring on it. Laura Nicole Driessen, Postdoctoral Researcher in Radio Astronomy, University of Sydney
News18
2 days ago
- Science
- News18
Move over Mercury – Chiron is in retrograde. What even is Chiron?
Sydney, Aug 9 (The Conversation) You might have seen an interesting phrase popping up in your social media feeds lately: 'Chiron is in retrograde." If you're anything like me, you've never heard of Chiron before – and I'm a professional astronomer. So what is Chiron, and what does it mean to be in retrograde? The short answer is that Chiron is an asteroid-slash-comet orbiting somewhere past Jupiter and Saturn. And until January 2026, it's going to look like it's going backwards in the sky. If you can spot it. But there's a bit more to the story. What is Chiron? Chiron's official name is (2060) Chiron. First things first: it's pronounced 'kai-ruhn", with a hard K sound. It was discovered by astronomer Charles Kowal in 1977. This was long after the system of Western astrology was developed, which probably explains why people who check their daily horoscopes are also blissfully unaware of its existence. It was initially classified as an asteroid, or a rock in space. In 1989 astronomers discovered Chiron sometimes has a tail or 'coma", which tells us that it's actually a comet or a 'dirty snowball". Since then, Chiron has been classified as both an asteroid and a comet. In 2023, more than 45 years after it was first discovered, astronomers confirmed Chiron has rings. This makes it the fourth non-planet in the Solar System to have rings. (The planets Jupiter, Saturn, Uranus and Neptune have rings, as do the asteroid Chariklo and the dwarf planets Haumea and Quaoar.) Chiron orbits the Sun in an oval-shaped orbit. The closest it gets to the Sun is about 1.3 billion kilometres (about eight times the distance between Earth and the Sun) and the furthest it gets from the Sun is a whopping 2.7 billion km (about 19 times the distance between Earth and the Sun). This puts it between the orbits of Jupiter and Uranus, cutting through the orbit of Saturn. Centaurs in space Chiron is a member of the Centaurs. This is a group of small Solar System bodies that orbit the Sun between Jupiter and Neptune. Their orbits are highly unstable: they change over time because of gravitational interactions with the giant planets. In Greek mythology, centaurs were creatures with the lower body and legs of a horse and the torso and arms of a human. Chiron was the oldest centaur, the son of the Titan Kronos. He was considered the wisest centaur. Fans of Percy Jackson and the Olympians may also recognise Chiron as the director of Camp Halfblood. Chiron in retrograde In astronomy, retrograde motion is when something is going backwards compared with everything else. Apparent retrograde motion is where an object in the sky, such as a planet, appears to be going backwards when we look at it from Earth. The object hasn't actually changed direction; it just looks like it from our perspective. All the planets (and Chiron) orbit the Sun in the same direction. This means the planets typically look like they are moving in a west-to-east direction across the sky. But when Earth 'catches" up to a planet (or a planet catches up to Earth) and overtakes it, the planet temporarily appears to move in a west-to-east direction in the sky. This temporary illusion is apparent retrograde motion. It's just like when you're driving in a car and overtake a slower car, that slower car looks like it's going backwards as you overtake it. Chiron went into retrograde (that is, apparent retrograde motion) on July 30, 2025 and will go back to normal on January 2, 2026. But unless you have a telescope or do some long-exposure photography, you'd never know which way Chiron is travelling. Chiron is very faint, so you can't see it with your eyes. The ancient astrologers didn't know about Chiron, but I like to think they'd appreciate a centaur in space with a ring on it. (The Conversation) GRS GRS (This story has not been edited by News18 staff and is published from a syndicated news agency feed - PTI) view comments First Published: August 09, 2025, 12:30 IST News agency-feeds Move over Mercury – Chiron is in retrograde. What even is Chiron? Disclaimer: Comments reflect users' views, not News18's. Please keep discussions respectful and constructive. Abusive, defamatory, or illegal comments will be removed. News18 may disable any comment at its discretion. By posting, you agree to our Terms of Use and Privacy Policy.
The Independent
3 days ago
- Science
- The Independent
What is Chiron? The asteroid currently in retrograde
You might have seen an interesting phrase popping up in your social media feeds lately: 'Chiron is in retrograde.' If you're anything like me, you've never heard of Chiron before – and I'm a professional astronomer. So what is Chiron, and what does it mean to be in retrograde? The short answer is that Chiron is an asteroid -slash-comet orbiting somewhere past Jupiter and Saturn. And until January 2026, it's going to look like it's going backwards in the sky. If you can spot it. But there's a bit more to the story. What is Chiron? Chiron's official name is (2060) Chiron. First things first: it's pronounced 'kai-ruhn', with a hard K sound. It was discovered by astronomer Charles Kowal in 1977. This was long after the system of Western astrology was developed, which probably explains why people who check their daily horoscopes are also blissfully unaware of its existence. It was initially classified as an asteroid or a rock in space. In 1989, astronomers discovered that Chiron sometimes has a tail or 'coma', which tells us that it's actually a comet or a 'dirty snowball'. Since then, Chiron has been classified as both an asteroid and a comet. In 2023, more than 45 years after it was first discovered, astronomers confirmed that Chiron has rings. This makes it the fourth non-planet in the Solar System to have rings. (The planets Jupiter, Saturn, Uranus and Neptune have rings, as do the asteroid Chariklo and the dwarf planets Haumea and Quaoar.) Chiron orbits the Sun in an oval-shaped orbit. The closest it gets to the Sun is about 1.3 billion kilometres (about eight times the distance between Earth and the Sun) and the furthest it gets from the Sun is a whopping 2.7 billion km (about 19 times the distance between Earth and the Sun). This puts it between the orbits of Jupiter and Uranus, cutting through the orbit of Saturn. Centaurs in space Chiron is a member of the Centaurs. This is a group of small Solar System bodies that orbit the Sun between Jupiter and Neptune. Their orbits are highly unstable: they change over time because of gravitational interactions with the giant planets. In Greek mythology, centaurs were creatures with the lower body and legs of a horse and the torso and arms of a human. Chiron was the oldest centaur, the son of the Titan Kronos. He was considered the wisest centaur. Fans of Percy Jackson and the Olympians may also recognise Chiron as the director of Camp Halfblood. Chiron in retrograde In astronomy, retrograde motion is when something is going backwards compared with everything else. Apparent retrograde motion is where an object in the sky, such as a planet, appears to be going backwards when we look at it from Earth. The object hasn't actually changed direction; it just looks like it from our perspective. All the planets (and Chiron) orbit the Sun in the same direction. This means the planets typically look like they are moving in a west-to-east direction across the sky. But when Earth 'catches' up to a planet (or a planet catches up to Earth) and overtakes it, the planet temporarily appears to move in a west-to-east direction in the sky. This temporary illusion is apparent retrograde motion. It's just like when you're driving in a car and overtake a slower car, that slower car looks like it's going backwards as you overtake it. Chiron went into retrograde (that is, apparent retrograde motion) on July 30, 2025, and will go back to normal on January 2, 2026. But unless you have a telescope or do some long-exposure photography, you'd never know which way Chiron is travelling. Chiron is very faint, so you can't see it with your eyes. The ancient astrologers didn't know about Chiron, but I like to think they'd appreciate a centaur in space with a ring on it. Laura Nicole Driessen is a Postdoctoral Researcher in Radio Astronomy at the University of Sydney.
