File:Comet-2IBorisov-HubbleST-20191016_(cropped).png · Wikimedia Commons · See Wikimedia Commons
Q67328765
Sign in to saveAlso known as ISO 2I/Borisov, ISO 2I
2I/Borisov, originally designated C/2019 Q4 (Borisov), is the first observed rogue comet and the second observed interstellar interloper, after ʻOumuamua. It was discovered by the Crimean amateur astronomer and telescope maker Gennadiy Borisov on 29 August 2019 UTC (30 August local time) in MARGO Observatory.
Key facts
- Comet.name
- 2I/Borisov
- Comet.image
- Comet-2IBorisov-HubbleST-20191016 (cropped).png
- Comet.caption
- Comet Borisov in October 2019
- Comet.discoverer
- Gennadiy Borisov
- Comet.discovery_date
- 29 August 2019
- Comet.discovery_site
- MARGO Observatory, Crimea
- Comet.mpc_name
- C/2019 Q4
- Comet.designations
- gb00234
- Comet.epoch
- 5 January 2020 (JD 2458853.5)
- Comet.observation_arc
- 964 days
- Comet.obs
- 3,360
- Comet.earliest_precovery_date
- 13 December 2018
- Comet.semimajor
- –0.8515 AU
- Comet.inclination
- 44.053°
- Comet.eccentricity
- 3.3565
- Comet.asc_node
- 308.15°
- Comet.arg_peri
- 209.12°
- Comet.Earth_moid
- 1.093 AU
via Wikipedia infobox
Wikidata facts
- Named after
- Gennadij Borisov
- Followed by
- 3I/ATLAS
- Follows
- Q42313338
- Radius
- 0.000062
- Image
- Comet-2IBorisov-HubbleST-20191016 (cropped).png
Show 14 more facts
- provisional designation
- C/2019 Q4
- Commons category
- 2I/Borisov
- discoverer or inventor
- Gennadij Borisov
- time of discovery or invention
- 2019-08-30
- orbital inclination
- 44.05257068647377
- argument of periapsis
- 209.12367864
- periapsis
- 2.006581893840375
- longitude of ascending node
- 308.1487262895379
- epoch
- August 1, 2020
- absolute magnitude
- 13.7
- semi-major axis of an orbit
- -0.8516123560275226
- mean anomaly
- 296.5442557294122
- time of periapsis
- 2458826.0450702133
- orbital eccentricity
- 3.356215101434632
via Wikidata · CC0
~15 min read
Encyclopedic overview
16 sectionsContents
- Nomenclature
- Characteristics
- Size and shape
- Rotation
- Chemical makeup and nucleus structure
- Trajectory
- Observation
- Discovery
- Observation
- Comet chemistry
- Suspected nucleus fragmentation
- Exploration
- See also
- Notes
- References
- External links
2I/Borisov, originally designated C/2019 Q4 (Borisov), is the first observed rogue comet and the second observed interstellar interloper, after ʻOumuamua. It was discovered by the Crimean amateur astronomer and telescope maker Gennadiy Borisov on 29 August 2019 UTC (30 August local time) in MARGO Observatory.
2I/Borisov has a heliocentric orbital eccentricity of 3.36 and is not bound to the Sun. The comet passed through the ecliptic of the Solar System at the end of October 2019, and made its closest approach to the Sun at just over on 8 December 2019. The comet passed closest to Earth on 28 December 2019. In November 2019, astronomers from Yale University said that the comet's tail was 14 times the size of Earth, and stated, "It's humbling to realize how small Earth is next to this visitor from another solar system."
Excerpted from Wikipedia’s “Q67328765” article, available under the CC BY-SA 4.0 licence.