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The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field

T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read PLATO's first long-pointing field, LOPS2, is formally approved and meets all Science Requirement Document target counts.

desk verdict A solid, honest characterization of PLATO's first long-pointing field; the central claim holds despite an uncited engineering threshold. read the letter →

arxiv 2501.07687 v3 pith:OAZETIAQ submitted 2025-01-13 astro-ph.EP astro-ph.IMastro-ph.SR

classification astro-ph.EPastro-ph.IMastro-ph.SR
keywords PLATOmissionlong-pointingfieldLOPS2selectiontransitingexoplanetstargetsamplesP1-P5dutycycleTESSsynergy
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper announces and characterizes the first field that the PLATO mission will stare at for at least two continuous years: LOPS2, a $2{,}149$ deg$^2$ southern sky region centered at ecliptic latitude $\beta=-71.12^\circ$. The authors argue that LOPS2 satisfies the mission's Scientific Requirements Document, with $8{,}235$ P1 targets against a requirement of $7{,}500$, and similarly comfortable margins for the P2, P4, and P5 samples. The choice matters because PLATO allocates 8% of its data rate to Guest Observer programs, so the community needs to know well in advance where the fields will be. The paper maps what actually lives inside LOPS2: 108 confirmed transiting planets, 544 vetted TESS candidates, 77 non-transiting planets, 367 star clusters, and strong overlap with TESS, CHEOPS, Ariel, and JWST. The conclusion, on the paper's own terms, is that LOPS2 is both operationally compliant and scientifically rich enough to anchor the planet-hunting campaign.

What carries the argument

The load-bearing object is the LOPS2 footprint: a $2{,}149$ deg$^2$ region approximated by a spherical circle of radius $28.1^\circ$ intersected with a great-circle 'square,' partitioned into zones observed by 24, 18, 12, or six of PLATO's normal cameras. The selection logic runs through three constraints: the duty-cycle threshold $|\beta|>69.671^\circ$ for the field center, the rotation angle $\varphi=0^\circ$ (with one field side nearly tangent to the galactic plane), and the target-count requirements of the Science Requirements Document. The target counts are produced by the PLATO Input Catalog v2.0.0 together with the PINE noise model, which assigns a noise-to-signal ratio to each star and determines which stars enter the P1, P2, P4, and P5 samples. The spacecraft's quarterly 90-degree rolls keep solar illumination on the panels during the two-year stare, and that mechanism is what ties the geometry to the duty-cycle constraint.

What would settle it

Recompute the P1–P5 counts with the final public PLATO Input Catalog and the actual number of functioning normal cameras after commissioning; if the P1 count falls below 7,500, the paper's compliance claim fails. Alternatively, an in-flight demonstration that the solar panels cannot sustain the duty cycle at ecliptic latitude $-71.12^\circ$ with the planned quarterly rolls would invalidate the choice of LOPS2, independent of any target-count argument.

Watch

Extended reading notes

Core claim

The central claim is that LOPS2—centered at $\alpha=95.31043^\circ$, $\delta=-47.88693^\circ$ with rotation angle $\varphi=0^\circ$ and ecliptic latitude $\beta=-71.12242^\circ$—was formally approved by the PLATO Science Working Team in June 2023 as the first long-pointing field, and that it meets the SciRD requirements for all four PLATO target samples. The counts, computed from the PLATO Input Catalog v2.0.0 under the conservative end-of-life assumption of 22 surviving normal cameras, are $P1=8{,}235$ (requirement $7{,}500$), $P2=699$ ($500$), $P4=12{,}415$ ($2{,}500$), and $P5=167{,}149$ ($122{,}500$). The shift from the earlier LOPS1 candidate to LOPS2 is justified by a single engineering constraint: LOPS1's $|\beta|\simeq66.30^\circ$ falls below the duty-cycle threshold $|\beta|>69.671^\circ$ required for an observing quarter to start at any time without interruption, while LOPS2 clears it. The paper claims this move costs only about 1% in the prioritization metric and 0.4% in P1 count, leaving the field comfortably within requirements and with a rich astrophysical content for planet and stellar science.

Load-bearing premise

The load-bearing premise is that the spacecraft can actually keep its solar panels adequately illuminated while staring continuously at the LOPS2 patch of sky for two years, using the planned quarterly 90-degree rotations; if that engineering constraint is wrong, the field choice collapses even though the star counts are right.

Editorial extensions

If this is right

  • If the field choice holds, PLATO's first two years of routine science, starting around mid-2027, will be spent continuously monitoring LOPS2, with quarterly rolls at the end of January, April, July, and October.
  • The field supplies 179,564 FGKM stars across the four target samples, from which up to 20,000 will be selected as the prime sample for ground-based follow-up and planetary mass measurement.
  • Within its first months of photometry, PLATO will sharpen the ephemerides of known planets in the field, whose median predicted timing drift at epoch 2027.0 is about 7 minutes, and will recover the ten systems currently lost to drift larger than two hours.
  • The overlap with other facilities means TESS's southern continuous viewing zone is ~90% covered by LOPS2, JWST's southern continuous viewing zone is fully enclosed, and most of the field is accessible to southern survey telescopes, while CHEOPS reaches only 33% of the footprint under its current sun-exclusion angle.
  • For targets with loose ephemerides, the first two or three months of LOPS2 photometry will deliver new accurate transit predictions, enabling follow-up observations that are currently unfeasible.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • An extension of the paper's logic is that the same duty-cycle threshold will constrain the northern field LOPN1: if it is ever scheduled, its rotation angle may need adjustment (for instance, to place Deneb in a CCD gap) even though the paper does not state a final choice.
  • The released footprint and target tables make LOPS2 a natural testbed for the Guest Observer selection process: any proposed GO target can be checked against the same P1–P5 and facility-overlap metrics, a procedure the paper demonstrates but does not codify.
  • The dense overlap with TESS's southern continuous viewing zone implies a testable prediction: PLATO should confirm or reject a large fraction of the 27 multi-candidate TOI systems inside LOPS2 within its first year, independently validating the field's expected planetary yield.
  • The paper's compliance argument depends on the 'EOL 22' assumption of 22 functioning normal cameras; if in-orbit losses are larger, the P1 count could approach the 7,500 floor since P1 stars concentrate in the 18- and 24-camera regions.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. This paper presents LOPS2, the southern long-pointing field that the PLATO Science Working Team approved in June 2023 as the first field for at least two continuous years of observation. The work describes the fine-tuning that led from the provisional LOPS1 to LOPS2, reports the field geometry and target counts in the P1, P2, P4, and P5 samples using the PIC v2.0.0 catalog and the PINE noise model, and surveys the astrophysical content of the field: known transiting and non-transiting planetary systems, TESS candidates, nearby stars, star clusters, variable stars, and synergies with TESS, CHEOPS, Ariel, and JWST. The target counts are claimed to meet the SciRD requirements with margin.

Significance. If correct, this paper gives the community the precise location and expected scientific content of PLATO's first long-pointing field, which is essential for planning Guest Observer programs, follow-up observations, and archival work. The paper is strong in that the field footprint is released as MOC regions on Zenodo, the target counts are derived from stated public catalogs and a cited noise model, and the authors explicitly acknowledge that in-flight optical performance may change the numbers. The extensive list of known and candidate planets, clusters, and variables in LOPS2 is a useful reference. The main scientific claim—that the field satisfies the PLATO sample requirements—is supported by the quoted counts, though those counts lack quantitative uncertainty estimates. The selection-process narrative, however, rests partly on an uncited engineering threshold, which is the weakest point of the manuscript.

major comments (3)
  1. [Section 2.1] The duty-cycle threshold of |β| > 69.671° is presented as a concluded value from 'a detailed assessment of the problem with the PLATO mission team,' but no derivation, citation, or reference to a public technical document is given. This threshold is the sole quantitative reason LOPS1 (β ≈ 66.30°) is abandoned in favor of LOPS2 (β ≈ 71.12°), and it is thus load-bearing for the paper's account of the field-selection process. Please supply a citation to an accessible PLATO mission document, present the underlying calculation, or explicitly state that this is an internal mission input and discuss how the choice would change under plausible variations of the threshold (e.g., if the threshold were 68° or 69°). As written, the causal chain from engineering constraint to field selection is not independently checkable.
  2. [Section 2.1 / Section 2.4 / Table 2] The target counts for P1, P2, P4, and P5 are quoted to integer precision without any uncertainty estimate. The paper notes in the Introduction that exact numbers may change with in-flight optical performance, but it does not quantify the sensitivity of the counts to underlying assumptions such as the PIC version, the PINE noise model, the FOV geometry, or the 'EOL 22' scenario. Since the margins above the SciRD requirements are relatively small for P1 (8,235 vs. 7,500) and P2 (699 vs. 500), a quantitative or at least a clearly bounded systematic uncertainty would strengthen the claim that the field robustly meets the mission requirements.
  3. [Section 2.1] The text states that for |β| > 70° all rotation angles are compatible with the duty cycle, but then sets the required threshold at |β| > 69.671°, which lies in the 'constrained' range 63°–70°. This apparent inconsistency should be clarified. Is the requirement that the geometrical center have |β| ≥ 69.671°, or is it a condition on the existence of an acceptable rotation angle? The distinction matters because LOPS2 at |β| ≈ 71.12° is unambiguously in the unconstrained regime, but LOPS1 at 66.30° is not; explaining this cleanly would make the selection logic easier to follow.
minor comments (5)
  1. [Section 2.1] The phrase 'slightly more stringent than the formal requirement of |β| > 63°' is misleading: an increase from 63° to 69.671° is a 6.7° change, not a slight adjustment. Please rephrase, for example by comparing to the 70° condition.
  2. [Section 2.1] There is a typo in 'the the dates of the quarterly rotations'—one 'the' should be removed.
  3. [Section 3.4.1] Several planet names appear with a space in 'W ASP-121b,' 'W ASP-126b,' etc. The standard formatting should be 'WASP-121b' and so on throughout the text and tables.
  4. [Section 2.2] The sentence 'the field is color coded according to the number of co-pointing cameras, as in Fig. 1' is correct, but Figure B.2 would benefit from a note that the rotation angles are shown in reading order, which is already in the caption; consider adding this to the text reference as well.
  5. [Appendix B] Table B.2 is very long and would be better presented primarily as a machine-readable table on Zenodo, with a short excerpt in the paper; this would be more useful to the community than a 14-page printed table.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: field selection and target counts rely on external engineering thresholds and independent catalogs.

full rationale

The paper's central claims are (i) that LOPS2 was formally approved as the first LOP field and (ii) that LOPS2 contains enough P1-P2-P4-P5 targets to meet SciRD requirements. Claim (i) is an administrative record, not a derivation; the duty-cycle threshold |β| > 69.671 in Section 2.1 is an engineering input reported from a mission assessment, not a quantity fitted to the paper's own outputs, so the LOPS1-to-LOPS2 switch is a decision rule applied to an external constraint rather than a circular reduction. Claim (ii) is computed by applying sample definitions and noise limits to the PLATO Input Catalog v2.0.0 with PINE noise estimates, which are independent external products. The paper's self-citations (N22 Paper I, M21) define the sample classes and the prioritization metric, but the target counts and astrophysical content are evaluated from catalogs such as PIC, Exo-MerCat, TOI, YBSC, Gaia DR3, and Hunt & Reffert 2023, rather than being recovered from those definitions. There is no equation in which a 'prediction' equals a fitted parameter by construction, and no load-bearing uniqueness theorem is imported from the authors' prior work. The uncited engineering threshold is a transparency and verifiability weakness, not circularity.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

The paper does not fit any parameters to data or invent new physical entities. It relies on mission engineering constraints (duty cycle threshold, camera survival), input catalogs (PIC v2.0.0), and a noise model (PINE). These are not derived in the paper.

assumptions (4)
  • domain assumption Duty-cycle threshold |β| > 69.671 deg for the field center
    Section 2.1: 'we concluded that the threshold must be set at |β| > 69.671...' This is an external engineering constraint that drives the choice of LOPS2 over LOPS1.
  • domain assumption PIC v2.0.0 catalog and PINE NSR model accurately predict target counts
    Section 3.1 uses these to compute P1-P5 counts; any error propagates directly to the headline numbers.
  • domain assumption End-of-life scenario with 22 surviving normal cameras (EOL 22)
    Table 2 notes counts are calculated assuming 22 NCAMs survive; the real number of working cameras affects the noise and thus P1 counts.
  • domain assumption Quarterly 90-degree rolls are operationally feasible
    Section 2.1 describes the roll schedule and states the exact dates are determined by the attitude; if the roll execution fails, the two-year stare may not be achievable.

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Cite this review

Pith. "Pith review of The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field." pith.science (2026). https://pith.science/paper/OAZETIAQ

@misc{pith2026250107687,
  author       = {Pith},
  title        = {Pith review of: The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/OAZETIAQ}},
  note         = {Machine review of arXiv:2501.07687}
}
read the original abstract

PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and nearby stars, and in particular habitable rocky planets hosted by solar-like stars. Over the mission lifetime, an average of 8% of the science data rate will be allocated to Guest Observer programs (GOs) selected by ESA through public calls, hence it is essential for the community to know in advance where the observing fields will be located. In a previous paper, we identified two preliminary long-pointing fields (LOPN1 and LOPS1) for PLATO, respectively in the northern and southern hemisphere. Here we present LOPS2, a slightly adjusted version of the southern field that has recently been selected by the PLATO Science Working Team as the first field to be observed by PLATO for at least two continuous years, following the scientific requirements. In this paper, we describe the astrophysical content of LOPS2 in detail, including known planetary systems, bright/variable/binary stars, clusters and synergies with other current and future facilities.

Figures

Figures reproduced from arXiv: 2501.07687 by the authors.

Figure 1
Figure 1. Geometry of the PLATO field FOV. In this figure, the field is centered at the origin (0,0) of a generic spherical reference frame (units are degrees; projection is orthographic). The number of “normal” cam￾eras covering a given line of sight is color coded. The four blue shades, from dark to light, map the regions covering 325/153/847/824 deg2 ob￾served respectively with 24, 18, 12, six cameras (and corresponding to… view at source ↗
Figure 2
Figure 2. All-sky Aitoff projection in galactic coordinates of LOPS2 and LOPN1, showing the formal constraints for the selection of the PLATO LOP fields and the synergies with other missions. The two pink circles represent the |β| > 63◦ technical requirement for the center of the LOP fields (“allowed region”), implying that the overall envelopes of every allowed field choice are two ecliptic caps at |β| ≳ 38◦ (green circles).… view at source ↗
Figure 3
Figure 3. LOPS2 footprint. Left panel: Orthographic projection in galactic coordinates centered on LOPS2. The field is color coded according to the number of NCAMs as in [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (10 more)
Figure 4
Figure 4. Figure 4: Interstellar extinction properties of LOPS2. Left panel: Average V-band extinction AV of the P1+P2 targets from PIC 2.0.0, calculated over HEALPix level-5 cells and represented in a color scale. Right panel: Same but for the P5 sample and over a finer level-6 grid. The…
Figure 5
Figure 5. Figure 5: Distance of the P1/P2 and P5 samples in LOPS2. Left panel: Distribution of the 8 235 P1+P2 stars in LOPS2 in the (R⋆, distance) plane. The stellar effective temperature from the PIC v2.0.0 is color coded. Right panel: Same but for the P5 sample (167 149 stars; P1/P2 no…
Figure 6
Figure 6. Figure 6: Bright stars and stellar crowding in LOPS2. Left panel: Orthographic projection in galactic coordinates centered on LOPS2. The field is color coded according to the number of NCAMs as in [PITH_FULL_IMAGE:figures/full_fig_p007_6.png]
Figure 7
Figure 7. Figure 7: Known planetary systems with at least one transiting planet in LOPS2 (orthographic projection in galactic coordinates). Left panel: Entries from the Exo-MerCat database (Section 3.4): single transiting planets (red circles), systems with multiple transiting planets (or…
Figure 8
Figure 8. Figure 8: Known planetary systems with at least one transiting planet in LOPS2. Left panel: Period-radius diagram with the 108 transiting planets identified from Exo-MerCat and plotted in the left panel of [PITH_FULL_IMAGE:figures/full_fig_p009_8.png]
Figure 9
Figure 9. Figure 9: Known non-transiting planetary systems in LOPS2 (orthographic projection in galactic coordinates). Left panel: Entries from the Exo￾MerCat database (Section 3.4): planets discovered through RVs (red diamonds), direct imaging (yellow circles), astrometry (gray circle), …
Figure 10
Figure 10. Figure 10: Open clusters and associations in LOPS2. Left panel: Sky map of the 367 clusters identified by Hunt & Reffert (2023) at high confidence and with at least one member in LOPS2, plotted as red circles with radius r50 (radius containing 50% of the members within the tidal…
Figure 11
Figure 11. Figure 11: Open clusters and associations in LOPS2. Left panel: the 367 clusters identified by Hunt & Reffert (2023) at high confidence and with at least one member in LOPS2, plotted as a function of their distance and areal density (as defined in the text). The logarithmic age …
Figure 12
Figure 12. Figure 12: Distribution of observed TESS targets in LOPS2, orthographic projection in galactic coordinates. Left panel: All 37 910 CTL targets within LOPS2 observed in short cadence by TESS from sector 1 to 82 included (black points), superimposed on the LOPS2 field. The yellow …
Figure 13
Figure 13. Figure 13: Overlap between CHEOPS/Ariel and LOPS2 (orthographic projection in galactic coordinates). Left panel: Sky area forbidden to CHEOPS (in magenta) due to the Sun Exclusion Angle currently set at 120◦ (corresponding to β < −60◦ for the southern ecliptic cap). P1 targets a…

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Forward citations

Cited by 3 Pith papers

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    astro-ph.SR 2025-11 conditional novelty 6.0 of 10

    PLATO should detect white-dwarf pulsation modes down to about 0.1 milli-magnitudes for bright targets, and the LOPS2 field contains 159 high-priority white-dwarf candidates for such measurements.

  3. The Stellar Observations Network Group (SONG) -- A Legacy Archive of Stellar Time-Domain Spectroscopy

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