# Kinematics of the Interstellar Vagabond 1I/‘Oumuamua (A/2017 U1)

@article{Mamajek2017KinematicsOT,
title={Kinematics of the Interstellar Vagabond 1I/‘Oumuamua (A/2017 U1)},
author={Eric E. Mamajek},
journal={Research Notes of the AAS},
year={2017},
volume={1}
}
• E. Mamajek
• Published 31 October 2017
• Physics, Geology
• Research Notes of the AAS
The initial Galactic velocity vector for the recently discovered hyperbolic asteroid 1I/'Oumuamua (A/2017 U1) is calculated for before its encounter with our solar system. The latest orbit (JPL-13) shows that 'Oumuamua has eccentricity > 1 at 944\sigma\, significance (1.19936 +- 0.00021), i.e. clearly unbound. Assuming no non-gravitational forces, the object's inbound Galactic velocity was U, V, W = -11.457, -22.395, -7.746 (+-0.009, +-0.009, +-0.011) km/s (U towards Galactic center), with…

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## References

SHOWING 1-10 OF 10 REFERENCES
Proxima’s orbit around α Centauri
• Physics, Geology
• 2016
Proxima and α Centauri AB have almost identical distances and proper motions with respect to the Sun. Although the probability of such similar parameters is, in principle, very low, the question as
The Palomar/MSU Nearby Star Spectroscopic Survey. IV. The Luminosity Function in the Solar Neighborhood and M Dwarf Kinematics*
• Physics
• 2002
We have used new astrometric and spectroscopic observations to refine the volume-complete sample of M dwarfs defined in previous papers in this series. With the addition of Hipparcos astrometry, our
CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57-531906.1 AT 2 pc FROM THE SUN
• Physics, Geology
• 2013
WISE J104915.57−531906.1 is a L/T brown dwarf binary located 2 pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We
Origin of Interstellar Object A/2017 U1 in a Nearby Young Stellar Association?
• Physics, Geology
• 2017
We suggest that the kinematics and properties of interstellar object A/2017 U1 point towards its formation in a protoplanetary disk in the ~45 Myr-old Carina or Columba young stellar associations,
Individual, Model-independent Masses of the Closest Known Brown Dwarf Binary to the Sun
• Physics, Geology
• 2017
At a distance of ∼2 pc, our nearest brown dwarf neighbor, Luhman 16 AB, has been extensively studied since its discovery 3 years ago, yet its most fundamental parameter—the masses of the individual
Comet showers and the steady-state infall of comets from the Oort cloud
The appearance of an inner edge to the Oort comet cloud at a semimajor axis of a = (1--2) x 10/sup 4/ AU is an observational artifact. Stellar perturbations are frequent enough and strong enough to
XHIP: An extended hipparcos compilation
• Physics, Geology
• 2012
We present the Extended Hipparcos Compilation (XHIP), a database of all stars in the New Reduction of the Hipparcos Catalog extensively cross-referenced with data from a broad survey of presently
The Galaxy in Context: Structural, Kinematic, and Integrated Properties
• Physics
• 2016
Our Galaxy, the Milky Way, is a benchmark for understanding disk galaxies. It is the only galaxy whose formation history can be studied using the full distribution of stars from faint dwarfs to
The Solar Neighborhood. XXX. Fomalhaut C
• Physics, Geology
• 2013
LP 876-10 is a nearby active M4 dwarf in Aquarius at a distance of 7.6 pc. The star is a new addition to the 10 pc census, with a parallax measured via the REsearch Consortium On Nearby Stars