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_healpix_29
int64
band
list
view
list
array
list
scale
list
jd
float32
diffmaglim
float32
magpsf
float32
sigmapsf
float32
chipsf
float32
magap
float32
sigmagap
float32
distnr
float32
magnr
float32
chinr
float32
sharpnr
float32
sky
float32
magdiff
float32
fwhm
float32
classtar
float32
mindtoedge
float32
seeratio
float32
magapbig
float32
sigmagapbig
float32
sgmag1
float32
srmag1
float32
simag1
float32
szmag1
float32
sgscore1
float32
distpsnr1
float32
jdstarthist
float32
scorr
float32
sgmag2
float32
srmag2
float32
simag2
float32
szmag2
float32
sgscore2
float32
distpsnr2
float32
sgmag3
float32
srmag3
float32
simag3
float32
szmag3
float32
sgscore3
float32
distpsnr3
float32
jdstartref
float32
dsnrms
float32
ssnrms
float32
magzpsci
float32
magzpsciunc
float32
magzpscirms
float32
clrcoeff
float32
clrcounc
float32
neargaia
float32
neargaiabright
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maggaia
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maggaiabright
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exptime
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drb
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acai_h
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acai_v
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acai_o
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acai_n
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acai_b
float32
new_drb
float32
peakmag
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maxmag
float32
peakmag_so_far
float32
maxmag_so_far
float32
age
float32
days_since_peak
float32
days_to_peak
float32
ra
float64
dec
float64
label
int64
fid
int64
programid
int64
field
int64
nneg
int64
nbad
int64
ndethist
int64
ncovhist
int64
nmtchps
int64
nnotdet
int64
N
int64
healpix
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isdiffpos
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is_SN
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near_threshold
bool
is_rise
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OBJECT_ID_
string
source_set
string
split
string
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End of preview. Expand in Data Studio

mmu_btsbot HATS Catalog Collection

This is the collection of HATS catalogs representing mmu_btsbot.

This dataset is part of the Multimodal Universe, a large-scale collection of multimodal astronomical data. For full details, see the paper: The Multimodal Universe: Enabling Large-Scale Machine Learning with 100TBs of Astronomical Scientific Data.

Access the catalog

We recommend the use of the LSDB Python framework to access HATS catalogs. LSDB can be installed via pip install lsdb or conda install conda-forge::lsdb, see more details in the docs. The following code provides a minimal example of opening this catalog:

import lsdb

# Full sky coverage.
catalog = lsdb.open_catalog("https://huggingface.co/datasets/UniverseTBD/mmu_btsbot")
# One-degree cone.
catalog = lsdb.open_catalog(
    "https://huggingface.co/datasets/UniverseTBD/mmu_btsbot",
    search_filter=lsdb.ConeSearch(ra=1.0, dec=78.0, radius_arcsec=3600.0),
)

Each catalog in this collection is represented as a separate Apache Parquet dataset and can be accessed with a variety of tools, including pandas, pyarrow, dask, Spark, DuckDB.

File structure

This catalog is represented by the following files and directories:

  • collection.properties — textual metadata file describing the HATS collection of catalogs
  • mmu_btsbot — main HATS catalog directory
    • dataset/ — Apache Parquet dataset directory for the main catalog
      • ... parquet metadata and data files in sub directories ...
    • hats.properties — textual metadata file describing the main HATS catalog
    • partition_info.csv — CSV file with a list of catalog HEALPix tiles (catalog partitions)
    • skymap.fits — HEALPix skymap FITS file with row-counts per HEALPix tile of fixed order 10
  • mmu_btsbot_10arcs/ — default margin catalog to ensure data completeness in cross-matching, the margin threshold is 10.0 arcseconds
    • ... margin catalog files and directories ...

Catalog metadata

Metadata of the main HATS catalog, excluding margins and indexes:

Number of rows Number of columns Number of partitions Size on disk HATS Builder
818,214 92 2,078 18.9 GiB hats-import v0.7.1, hats v0.7.1

Catalog columns

The main HATS catalog contains the following columns:

Name _healpix_29 band view array scale jd diffmaglim magpsf sigmapsf chipsf magap sigmagap distnr magnr chinr sharpnr sky magdiff fwhm classtar mindtoedge seeratio magapbig sigmagapbig sgmag1 srmag1 simag1 szmag1 sgscore1 distpsnr1 jdstarthist scorr sgmag2 srmag2 simag2 szmag2 sgscore2 distpsnr2 sgmag3 srmag3 simag3 szmag3 sgscore3 distpsnr3 jdstartref dsnrms ssnrms magzpsci magzpsciunc magzpscirms clrcoeff clrcounc neargaia neargaiabright maggaia maggaiabright exptime drb acai_h acai_v acai_o acai_n acai_b new_drb peakmag maxmag peakmag_so_far maxmag_so_far age days_since_peak days_to_peak ra dec label fid programid field nneg nbad ndethist ncovhist nmtchps nnotdet N healpix isdiffpos is_SN near_threshold is_rise OBJECT_ID_ source_set split object_id
Data Type int64 list<element: string> list<element: string> list<element: list<element: list<element: float>>> list<element: float> float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float float double double int64 int64 int64 int64 int64 int64 int64 int64 int64 int64 int64 int64 bool bool bool bool string string string int64
Value count 818,214 2,454,642 2,454,642 N/A 2,454,642 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214 818,214
Example row 270210874492301921 [r, r, r] [science, reference, difference] [[[0.01562, 0.01536, 0.01607, 0.01597, … (63 total)], … (63 total)], … [1.01, 1.01, 1.01] 2.46e+06 20.07 19.62 0.1505 1.172 19.69 0.2534 0.3195 19.37 3.737 0.527 0.09285 0.06265 2.08 0.979 468.5 1.341 19.48 0.2668 19.36 18.51 17.92 17.7 0.04042 2.737 2.459e+06 10.01 17.24 16.57 16.24 16.09 0.9923 12.25 20.73 20.13 19.93 19.83 0.766 13.17 2.458e+06 9.074 12.85 26.38 3.614e-06 0.02667 0.08524 6.388e-06 2.738 -999 19.5 -999 30 1 0.9969 0.0001698 8.935e-08 0.03556 8.846e-05 0.9999 18.36 20.36 18.36 20.36 53.82 41.92 11.9 0.5351 78.02 1 2 1 854 4 0 46 1494 8 1448 9 239 True True False False ZTF21acdjasw trues train 1776246164415015001
Minimum value 143192435166087 g difference N/A 1.0099999904632568 2458208.0 14.993193626403809 11.828742980957031 0.003804703475907445 0.061839427798986435 11.862600326538086 0.0010999999940395355 0.0005188093637116253 11.85200023651123 0.05999999865889549 -0.7940000295639038 -148.0614013671875 -0.6691054701805115 -0.9399999976158142 -0.0 10.00100040435791 -999.0 11.839099884033203 0.0010999999940395355 -999.0 -999.0 -999.0 -999.0 -0.0 0.00033156777499243617 2458042.0 5.000020980834961 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 2458154.5 -236.6349639892578 -2.804577350616455 21.37965202331543 7.099999947968172e-07 0.012311999686062336 -1.7358529567718506 1.4523000118060736e-06 -999.0 -999.0 -999.0 -999.0 30.0 -999.0 -0.0 -0.0 -0.0 -0.0 2.2476720598673186e-14 6.094935223188713e-09 10.285042762756348 12.511996269226074 10.285042762756348 12.511996269226074 -0.0 -0.0 -0.0 0.02237 -30.3120473 0 1 1 202 0 0 1 1 1 -62 1 0 True False False False ZTF17aaaamwo dims test 453441342515015017
Maximum value 3458697867235106154 r science N/A 1.0099999904632568 2460172.75 21.433073043823242 21.104284286499023 0.21714617311954498 9912.720703125 21.708900451660156 1.0729000568389893 26.693052291870117 23.976999282836914 13.935999870300293 1.4600000381469727 119.668701171875 0.9848169088363647 7.75 1.0 1535.1785888671875 11.868691444396973 21.631799697875977 1.669700026512146 27.165000915527344 27.964000701904297 26.252599716186523 22.355899810791016 1.0 29.914194107055664 2460166.75 536.3513793945312 27.81800079345703 24.626800537109375 23.552799224853516 22.370399475097656 1.0 29.998464584350586 27.92300033569336 24.05900001525879 24.337200164794922 23.570499420166016 1.0 29.999650955200195 2459138.75 7598.24658203125 14282.5029296875 27.262657165527344 0.6577643752098083 0.857014000415802 2.0040109157562256 2.592698097229004 89.99986267089844 89.99980926513672 21.386119842529297 13.999776840209961 30.0 1.0 1.0 0.9999991655349731 0.9999970197677612 0.9995384812355042 1.0 1.0 20.396743774414062 22.171342849731445 21.009519577026367 21.818437576293945 2128.044677734375 1942.9764404296875 2126.070068359375 359.9805578 87.9603521 1 2 1 1877 13 4 4314 10393 429 10308 2867 3071 True True True True ZTF23aawwabr vars val 2418290236115015016

"Value count" may be different from the total number of rows for nested columns: each nested element is counted as a single value.

Crossmatch with another catalog

HATS catalogs can be efficiently crossmatched using LSDB, which leverages the HEALPix partitioning to avoid loading the full datasets into memory:

import lsdb

mmu_btsbot = lsdb.open_catalog("https://huggingface.co/datasets/UniverseTBD/mmu_btsbot")
other = lsdb.open_catalog("https://huggingface.co/datasets/<org>/<other_catalog>")

crossmatched = mmu_btsbot.crossmatch(other, radius_arcsec=1.0)
print(crossmatched)

See the LSDB documentation for more details on crossmatching and other operations.

Dataset-specific context

Original survey
This dataset comes from the Zwicky Transient Facility (ZTF), specifically the Bright Transient Survey (BTS), which scans the Northern sky every 2–3 nights to detect and study bright, nearby transient events.

Data modality
The dataset is multimodal, combining image triplets (science, reference, and difference) with tabular metadata containing extracted features of each transient candidate.

Typical use cases
It is mainly used for detecting and classifying astrophysical transients, particularly distinguishing real events from bogus detections and supporting follow-up observations. The dataset was also used to develop the BTSbot model described in the original paper.

Caveats
Each sample corresponds to an alert rather than a unique object, so the same transient may appear multiple times. Early detections are typically noisier and harder to classify, and the dataset is biased toward bright, local transients matching BTS selection criteria.

Citation
Users should cite the ZTF/BTS survey and the BTSbot paper. The dataset is released under the CC BY 4.0 license, requiring attribution to the original authors.

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