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arxiv: 2606.30280 · v1 · pith:4KQW66HHnew · submitted 2026-06-29 · 🌌 astro-ph.EP

Multi-year Ground-Based Survey Photometry of Active Comet 103P/Hartley 2 and Centaur (2060) Chiron: A Tale of Two Comets in the Pre-LSST Era

Joseph Murtagh , Megan E. Schwamb , Michael S. P. Kelley , Matthew M. Knight , Thomas Lehmann , Giannantonio Milani , A. Fraser Gillan , Alan Fitzsimmons
show 17 more authors
Ryan R. Lyttle Matthew M. Dobson Carrie E. Holt Tim Lister Joseph P. Chatelain Sarah Greenstreet Quanzhi Ye Henry H. Hsieh Denis Bodewits Tracy X. Chen Richard G. Dekany Matthew J. Graham Steven L. Groom George Helou Mansi M. Kasliwal Ashish A. Mahabal Reed Riddle
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Pith reviewed 2026-06-30 03:49 UTC · model grok-4.3

classification 🌌 astro-ph.EP
keywords 103P/Hartley 22060 Chironcomet activityCentaur outburstheliocentric slopesphase curvesdust mass lossphotometry
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The pith

Comet 103P shows steeper inbound activity slopes than outbound while Chiron fades exponentially from its 2021 outburst over 1.4 years.

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

The paper uses multi-year ground-based photometry to measure long-term activity in Jupiter-family comet 103P/Hartley 2 during its 2023/24 apparition and in Centaur Chiron from 2020 to 2025 including its outburst. For 103P it reports asymmetric power-law indices of brightness versus heliocentric distance, steeper before perihelion than after, along with dust mass-loss estimates and color changes. For Chiron it subtracts a baseline to isolate the outburst decay and tracks flattening phase curves. These measurements bracket stages in the evolution of outer solar system objects into active inner ones, with 103P more depleted and Chiron still capable of episodic releases.

Core claim

For 103P, heliocentric activity slopes are asymmetric about perihelion, with a steep inbound index (n_r,pre=-3.48±0.08) and flatter outbound value (n_r,post=-1.16±0.04), consistent with enhanced relative dust contribution post-perihelion. Reduced brightness versus prior apparitions matches reported secular fading trends. Dust mass-loss rates are ~4-16 kg s^{-1} for assumed grain properties. For Chiron, subtracting a quiescent baseline reveals exponential decay from the 2021 outburst on a ~1.4 yr timescale. Seasonal phase curves flatten from β_o=0.150±0.034 mag deg^{-1} in 2021 to ≲0.09 mag deg^{-1} by 2023-2025, converging with quiescent behavior.

What carries the argument

Heliocentric activity slopes (power-law indices of reduced magnitude versus distance to the Sun) and quiescent baseline subtraction to isolate outburst decay.

If this is right

  • Dust production for 103P is estimated between 4 and 16 kg per second under the assumed grain sizes, density and albedo.
  • A blueward color trend appears near perihelion for 103P, consistent with gas contamination in the g-band.
  • A ~18.7 hour period is recovered in 103P data near perihelion and linked to activity.
  • Chiron's broad-band colors stay constant while its phase curve slope decreases toward quiescent values.
  • The observations suggest Chiron has entered an epoch of persistent low-level activity after the outburst.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The inbound-outbound asymmetry could arise from seasonal illumination of different surface regions or changing dust-to-gas ratios.
  • The measured decay timescale offers a way to estimate the size of the volatile reservoir driving the outburst.
  • Objects like Chiron may commonly transition into sustained low-level activity after large outbursts, affecting population statistics.
  • Longer baselines from future wide-field surveys would test whether these patterns hold across multiple apparitions.

Load-bearing premise

A single fixed set of grain properties converts observed brightness into dust mass-loss rates, and the chosen quiescent baseline accurately represents Chiron's non-outburst state across multiple years.

What would settle it

New photometry showing symmetric activity slopes for 103P around perihelion or Chiron brightness deviating from the fitted 1.4-year exponential decay after 2025.

Figures

Figures reproduced from arXiv: 2606.30280 by A. Fraser Gillan, Alan Fitzsimmons, Ashish A. Mahabal, Carrie E. Holt, Denis Bodewits, George Helou, Giannantonio Milani, Henry H. Hsieh, Joseph Murtagh, Joseph P. Chatelain, Mansi M. Kasliwal, Matthew J. Graham, Matthew M. Dobson, Matthew M. Knight, Megan E. Schwamb, Michael S. P. Kelley, Quanzhi Ye, Reed Riddle, Richard G. Dekany, Ryan R. Lyttle, Sarah Greenstreet, Steven L. Groom, Thomas Lehmann, Tim Lister, Tracy X. Chen.

Figure 1
Figure 1. Figure 1: Example observations of (2060) Chiron for sur￾vey/telescopes (left) ATLAS, (middle) ZTF, and (right) LCO/LOOK. On all images, the scale of the aperture size used is demarcated by a horizontal white line of length 5′′ . All panels have been rotated so that North is up and East is left. Also marked on each image are the anti-solar vec￾tor (yellow), and anti-motion vector (cyan) as obtained from JPL Horizons.… view at source ↗
Figure 2
Figure 2. Figure 2: Example observations of 103P/Hartley 2 for survey/telescopes (left) ATLAS, (middle) ZTF, and (right) LCO/LOOK. On all images, the scale of the aperture size used is demarcated by a horizontal white line of length 10,000 km. All panels have been rotated so that North is up and East is left. Also marked on each image are the anti-solar vector (yellow), and anti-motion vector (cyan) as obtained from JPL Horiz… view at source ↗
Figure 3
Figure 3. Figure 3: Distance- and phase-corrected light curves for 103P/Hartley 2 color-shifted to (top) ZTF-r band and (bottom) to ZTF-g band. Note that no phase correction is applied to the g-band (see Section 3). The different datasets are denoted via differing colors and markers. The solid black curve running over each dataset is a third order polynomial spline fit. Overplotted in a solid navy line in both plots is the da… view at source ↗
Figure 4
Figure 4. Figure 4: Light curves of the color-shifted magnitudes of 103P to (top) the ZTF-r band and (middle) the ZTF-g band. Overplotted on each are 105 synthetic Monte Carlo sam￾pled splines within measurement uncertainties. (bottom) The color evolution of 103P in ZTF (g − r) over the shared time range, with uncertainty on each data point being estimated by the 1σ uncertainties from the splines. evolving dust continuum (M. … view at source ↗
Figure 5
Figure 5. Figure 5: Color evolution of 103P in ZTF (g − r) as in [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (top) Generalized Lomb-Scargle periodograms for the measurements color-shifted to (lef t) ZTF r-band and (right) ZTF g-band measurements of 103P. Highlighted in gray is the strongest power frequency peak, with the False Alarm Probability (FAP, the probability that such a peak would arise from noise alone) 1% and 5% levels displayed as dashed and dash-dotted lines respectively. (bottom) shows the dataset ph… view at source ↗
Figure 8
Figure 8. Figure 8: Distance-corrected light curves for (2060) Chiron color-shifted to (top) ATLAS o band and (bottom) ATLAS c band. The different datasets are denoted via differing colors. The solid black curve running over each observing season in each dataset is a third order polynomial spline fit. Over￾plotted in dash dotted navy lines in both plots is the date of contemporaneous JWST observations on 2023 Jul 12 (N. Pinil… view at source ↗
Figure 7
Figure 7. Figure 7: Rotational phase-folded residual light curves for 103P using the same epochs, measured rotational period T, and light curve amplitudes A (denoted on top of each sub￾plot) from T. Lehmann (2025) with our survey/telescope dataset. (top) is the color-shifted to ZTF-r band data, and (bottom) is the color-shifted to ZTF-g band data. Overplot￾ted in solid blue is the best fit single-peaked sinusoid mea￾sured. 4.… view at source ↗
Figure 9
Figure 9. Figure 9: Distance-corrected light curves for Chiron color-shifted to (top) ATLAS o band. The different datasets are denoted via differing colors. The solid black curve represents an exponential decay fit to the 30-day binned median data from 2021 post-opposition and onward. The gray dashed line represents the baseline quiescence magnitude, calculated as the median of 2020’s observing season. ports the interpretatio… view at source ↗
Figure 10
Figure 10. Figure 10: Residual phase curves, converted to flux space, for Chiron after subtracting off the quiescent 2015-2019 phase curve flux (M. M. Dobson et al. 2024) for (top) the color-shifted to ATLAS o band data, and (bottom) the col￾or-shifted to ATLAS c band data. Each panel represents a new observing season of data, with the 2020 phase curve in￾cluded as a baseline for quiescent activity. Notably, although the late-… view at source ↗
Figure 12
Figure 12. Figure 12 [PITH_FULL_IMAGE:figures/full_fig_p017_12.png] view at source ↗
Figure 11
Figure 11. Figure 11: Light curves of the color-shifted magnitudes of Chiron to (top) the ATLAS o band and (middle) the ATLAS c band. Overplotted on each are 105 synthetic Monte Carlo sampled splines within measurement uncertainties. (bottom) The color evolution of Chiron in ATLAS (c − o) over the shared time range, with uncertainty on each data point be￾ing estimated by the 1σ uncertainties from the splines. The dashed horizo… view at source ↗
read the original abstract

Comets and Centaurs trace the evolution of trans-Neptunian objects (TNOs) into the inner solar system. Their activity reflects the interplay between volatile sublimation, dust dynamics, and ring scattering. Yet the long-term behavior of individual objects is less constrained. To probe this evolutionary transition, we use wide-field survey photometry from the Asteroid Terrestrial-impact Last Alert System, Zwicky Transient Facility, and Las Cumbres Observatory observations of the Jupiter-family comet (JFC) 103P/Hartley 2 during its 2023/24 apparition, and the Centaur (2060) Chiron across 2020-2025, including its 2021 outburst. For 103P, heliocentric activity slopes are asymmetric about perihelion, with a steep inbound index ($n_{r,\rm pre}=-3.48\pm0.08$) and flatter outbound value ($n_{r,\rm post}=-1.16\pm0.04$), consistent with enhanced relative dust contribution post-perihelion. Reduced brightness versus prior apparitions matches reported secular fading trends. Dust mass-loss rates are $\sim4$-16 kg s$^{-1}$ for assumed grain properties. Colors exhibit a blueward trend near perihelion, consistent with enhanced gas contamination of the $g$-band, with possible phase-dependent scattering. A periodogram recovers a $\sim18.7$ hr activity-linked period near perihelion. For Chiron, subtracting a quiescent baseline reveals exponential decay from the 2021 outburst on a $\sim1.4$ yr timescale. Seasonal phase curves flatten from $\beta_o=0.150\pm0.034$ mag deg$^{-1}$ in 2021 to $\lesssim0.09$ mag deg$^{-1}$ by 2023-2025, converging with quiescent behavior. Broad-band colors remain unchanged at ATLAS ($c-o$)=0.22$\pm$0.09 mag. This extended activity suggests a new epoch of persistent, low-level activity and/or evolving ring-scattering. These objects bracket the TNO-to-JFC evolutionary sequence, with 103P near the volatile-depleted end, and Chiron still volatile-rich and capable of episodic activity.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The manuscript reports multi-year ground-based photometry of Jupiter-family comet 103P/Hartley 2 during its 2023/24 apparition and Centaur (2060) Chiron from 2020-2025 using ATLAS, ZTF, and LCO data. Key results include asymmetric heliocentric activity slopes for 103P (n_r,pre = -3.48 ± 0.08 inbound; n_r,post = -1.16 ± 0.04 outbound), interpreted as enhanced post-perihelion dust contribution, dust mass-loss rates of ~4-16 kg s^{-1} under fixed grain assumptions, a blueward color trend near perihelion, and a ~18.7 hr activity-linked period; for Chiron, subtraction of a quiescent baseline reveals exponential decay from the 2021 outburst on a ~1.4 yr timescale, with seasonal phase curves flattening from β_o = 0.150 ± 0.034 mag deg^{-1} (2021) to ≲ 0.09 mag deg^{-1} (2023-2025) and unchanged broadband colors.

Significance. If the photometric measurements and derived timescales hold, the work supplies extended temporal coverage of activity in objects bracketing the TNO-to-JFC evolutionary sequence, yielding specific, falsifiable quantities (asymmetric slopes, outburst decay constant) for comparison against volatile sublimation and dust-dynamics models. The direct reporting of fitted indices with uncertainties and the use of survey photometry for long-baseline monitoring are strengths.

major comments (2)
  1. [103P dust mass-loss calculation (results section)] The dust mass-loss rates of 4-16 kg s^{-1} for 103P are obtained by converting observed brightness using a single fixed set of grain size, density, and albedo values; no sensitivity tests or alternative grain models are shown, which directly affects the robustness of the claim that the flatter outbound slope indicates enhanced relative dust contribution post-perihelion.
  2. [Chiron outburst decay analysis (results section)] The ~1.4 yr exponential decay timescale for Chiron is derived after subtracting a chosen quiescent baseline from the 2020-2025 photometry; the manuscript provides no explicit justification, validation across the full interval, or alternative baseline choices, rendering the decay constant sensitive to this step.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments, which help improve the clarity and robustness of our analysis. We address each major comment below and will incorporate revisions to strengthen the manuscript.

read point-by-point responses

  1. Referee: [103P dust mass-loss calculation (results section)] The dust mass-loss rates of 4-16 kg s^{-1} for 103P are obtained by converting observed brightness using a single fixed set of grain size, density, and albedo values; no sensitivity tests or alternative grain models are shown, which directly affects the robustness of the claim that the flatter outbound slope indicates enhanced relative dust contribution post-perihelion.

    Authors: The reported mass-loss rates are derived under fixed grain assumptions, as is standard when direct constraints on grain properties are unavailable from photometry alone. The 4-16 kg s^{-1} range primarily reflects the observed brightness variations across the apparition rather than grain parameter variations. Importantly, the asymmetric heliocentric slopes (n_r,pre = -3.48 ± 0.08; n_r,post = -1.16 ± 0.04) are measured directly from the photometry and are independent of absolute scaling by grain properties; the interpretation of enhanced relative dust contribution post-perihelion follows from this slope difference. To address the concern, we will add a sensitivity analysis in the revised results section, varying grain radius (1-100 μm), density (0.5-2 g cm^{-3}), and albedo (0.04-0.1) within cometary ranges, confirming that the inbound/outbound slope asymmetry and relative dust interpretation remain robust. revision: yes

  2. Referee: [Chiron outburst decay analysis (results section)] The ~1.4 yr exponential decay timescale for Chiron is derived after subtracting a chosen quiescent baseline from the 2020-2025 photometry; the manuscript provides no explicit justification, validation across the full interval, or alternative baseline choices, rendering the decay constant sensitive to this step.

    Authors: The quiescent baseline was chosen from the 2020 pre-outburst data and the apparent return to similar levels by 2024-2025, consistent with the object's long-term behavior outside outbursts. We agree that explicit justification and validation were not provided. In revision, we will expand the methods and results sections to detail the baseline selection criteria (matching pre- and late-post-outburst photometry within uncertainties), include a validation plot across the full interval, and add a sensitivity test varying the baseline by ±0.2 mag (the observed scatter) to show the decay timescale remains within 1.2-1.6 yr. This will demonstrate robustness while preserving the reported ~1.4 yr value. revision: yes

Circularity Check

0 steps flagged

No circularity; direct photometric fits to new survey data

full rationale

The paper presents new multi-year photometry from ATLAS, ZTF, and LCO for 103P and Chiron. The reported heliocentric slopes (n_r,pre and n_r,post) and the ~1.4 yr exponential decay timescale are obtained by direct least-squares fitting to the observed brightness measurements after baseline subtraction. Mass-loss rates use explicit external assumptions on grain size/density/albedo rather than any self-referential definition or fitted parameter renamed as a prediction. No equations reduce a claimed result to its own inputs by construction, and no load-bearing self-citations or uniqueness theorems are invoked to justify the central observational claims. The derivation chain is therefore self-contained against the new data.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The central claims rest on standard photometric reduction assumptions and grain-property choices that are not independently measured in the paper.

free parameters (1)
  • grain size, density, and albedo
    Used to convert brightness to dust mass-loss rates of ~4-16 kg s^{-1}; values are assumed rather than fitted or measured here.
axioms (2)
  • domain assumption Standard comet photometry reduction and phase-function corrections apply without significant systematic bias from the survey pipelines.
    Invoked when deriving activity slopes and phase curves from ATLAS/ZTF/LCO data.
  • domain assumption A single quiescent baseline can be subtracted to isolate the 2021 outburst decay for Chiron.
    Required for the exponential-decay claim.

pith-pipeline@v0.9.1-grok · 6099 in / 1433 out tokens · 42400 ms · 2026-06-30T03:49:20.926493+00:00 · methodology

discussion (0)

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Reference graph

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