Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asteroid 16 Psyche: Shape, Features, and Global Map   We develop a shape model of asteroid 16 Psyche using observations acquired in
a wide range of wavelengths: Arecibo S-band delay-Doppler imaging, Atacama
Large Millimeter Array (ALMA) plane-of-sky imaging, adaptive optics (AO) images
from Keck and the Very Large Telescope (VLT), and a recent stellar occultation.
Our shape model has dimensions 278 (-4/+8) km x 238 (-4/+6) km x 171 (-1/+5)
km, an effective spherical diameter Deff = 222 -1/+4 km, and a spin axis
(ecliptic lon, lat) of (36 deg, -8 deg) +/- 2 deg. We survey all the features
previously reported to exist, tentatively identify several new features, and
produce a global map of Psyche. Using 30 calibrated radar echoes, we find
Psyche's overall radar albedo to be 0.34 +/- 0.08 suggesting that the upper
meter of regolith has a significant metal (i.e., Fe-Ni) content. We find four
regions of enhanced or complex radar albedo, one of which correlates well with
a previously identified feature on Psyche, and all of which appear to correlate
with patches of relatively high optical albedo. Based on these findings, we
cannot rule out a model of Psyche as a remnant core, but our preferred
interpretation is that Psyche is a differentiated world with a regolith
composition analogous to enstatite or CH/CB chondrites and peppered with
localized regions of high metal concentrations. The most credible formation
mechanism for these regions is ferrovolcanism as proposed by Johnson et al.
(Nature Astronomy vol 4, January 2020, 41-44).

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg