# Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)

@article{Jewitt2019InitialCO,
title={Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)},
author={David C. Jewitt and Jane X. Luu},
journal={The Astrophysical Journal},
year={2019}
}
• Published 6 October 2019
• Physics, Geology
• The Astrophysical Journal
We present initial observations of the interstellar body 2I/(2019 Q4) Borisov taken to determine its nature prior to the perihelion in 2019 December. Images from the Nordic Optical Telescope show a prominent, morphologically stable dust coma and tail. The dust cross-section within 15,000 km of the nucleus averages 130 sq. km (assuming geometric albedo 0.1) and increases by about 1 percent per day. If sustained, this rate indicates that the comet has been active for 100 days prior to the…

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## References

SHOWING 1-10 OF 29 REFERENCES
Disintegrating Inbound Long-period Comet C/2019 J2
• Physics, Geology
The Astrophysical Journal
• 2019
We present observations of the disintegrating long-period comet C/2019 J2 (Palomar) taken to determine the nature of the object and the cause of its demise. The data are consistent with break-up of a
APO Time Resolved Color Photometry of Highly-Elongated Interstellar Object 1I/'Oumuamua
• Physics, Geology
• 2017
We report on $g$, $r$ and $i$ band observations of the Interstellar Object 'Oumuamua (1I) taken on 2017 October 29 from 04:28 to 08:40 UTC by the Apache Point Observatory (APO) 3.5m telescope's
Detection of CN Gas in Interstellar Object 2I/Borisov
• Physics, Geology
The Astrophysical Journal
• 2019
The detection of Interstellar Objects passing through the Solar System offers the promise of constraining the physical and chemical processes involved in planetary formation in other extrasolar
Tumbling motion of 1I/‘Oumuamua and its implications for the body’s distant past
• Physics, Geology
• 2018
Models of the Solar System’s evolution show that almost all the primitive material leftover from the formation of the planets was ejected to the interstellar space as a result of dynamical
Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
• Physics, Geology
• 2017
We present observations of the interstellar interloper 1I/2017 U1 ('Oumuamua) taken during its 2017 October flyby of Earth. The optical colors B-V = 0.70$\pm$0.06, V-R = 0.45$\pm$0.05, overlap those
A brief visit from a red and extremely elongated interstellar asteroid
• Physics, Geology
Nature
• 2017
Observations and analysis of the object 1I/2017 U1 (‘Oumuamua) that demonstrate its extrasolar trajectory, and that enable comparisons to be made between material from another planetary system and from the authors' own, reveal it to be asteroidal with no hint of cometary activity despite an approach within 0.25 astronomical units of the Sun.
Col-OSSOS: Colors of the Interstellar Planetesimal 1I/‘Oumuamua
• Physics, Geology
• 2017
The recent discovery by Pan-STARRS1 of 1I/2017 U1 (`Oumuamua), on an unbound and hyperbolic orbit, offers a rare opportunity to explore the planetary formation processes of other stars, and the
Interstellar Interlopers: Number Density and Origin of ‘Oumuamua-like Objects
• Physics, Geology
• 2018
We provide a calculation of Pan-STARRS' ability to detect objects similar to the interstellar object 1I/2017 U1 (hereafter 'Oumuamua), including the most detectable approach vectors and the effect of
Color Systematics of Comets and Related Bodies
Most comets are volatile-rich bodies that have recently entered the inner solar system following long-term storage in the Kuiper belt and the Oort cloud reservoirs. These reservoirs feed several