RAS Journals

@rasjournals.bsky.social

Official account for Monthly Notices of the Royal Astronomical Society (MNRAS), Geophysical Journal International (GJI) and RAS Techniques and Instruments (RASTI). See also https://academic.oup.com/rasjournals

@rasjournals.bsky.social Oct 15, 2026, 9:02 AM

Published in #MNRAS: "AGC 322753: A dark galaxy candidate detected by ALFALFA and FASHI", Monaci et al. This is Fig. 2: please visit academic.oup.com/mnras/advanc... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Colour image made by combining the g, r, and i filters from Legacy Surveys. The dashed circle represents the 3.5 arcmin beam of the Arecibo radio telescope, while the solid circle represents the 3 arcmin beam of FAST. The crosses indicate the beam centroids. The white square highlights the position of the claimed OC by C.-P. Zhang et al. (2024) for this FASHI source. The white hexagon highlights the background galaxy (SDSS J224559 + 335532). The intersection between the two beams is the most probable location for the OC of AGC 322753, highlighted in the red inset. Here, marked sources with the short horizontal and vertical lines are foreground stars confirmed with Gaia DR3, and the galaxy marked by a white arrow is in the background. See the text.

@rasjournals.bsky.social Oct 15, 2026, 8:55 AM

Published in #GJI Geophysical Journal International: "Local seismic shear-wave splitting characteristics at the source region of 2015 Nepal Gorkha MW 7.8 earthquake in the middle Himalayan orogenic belt", Cao & Chang. Read the paper at academic.oup.com/gji/article/... . @royalastrosoc.bsky.social

Tectonic background and stations at source region. Red and green triangles represent broad-band and short-period seismometers, respectively. Blue circles are the epicentres of aftershocks (Y. Kuang & J. Li 2025). Yellow stars on the left and right sides give the location of MW 7.8 main shock and MW 7.3 aftershock, respectively. Black lines show the main tectonics: STD—Southern Tibetan Detachment System, MCT—Main Central Thrust fault, MBT—Main Boundary Thrust fault, MFT—Main Frontal Thrust fault, TYCR—Tangra Yum Co Rift, KCF—Kung Co Rift. NR, MR, and SR are different regions in the north-south direction, respectively. The focal mechanisms are the results of the Gorkha earthquake and some aftershocks (X. Wang et al. 2017; L. Bai et al. 2019; M.M. Mendoza et al. 2019). The lower left inset shows the movement of the Indian plate, and blue arrows give the GPS velocity field reference to the Eurasian plate (M. Wang & Z. Shen 2020).

@rasjournals.bsky.social Oct 15, 2026, 8:44 AM

Published in #RASTI RAS Techniques & Instruments: "Any colour you like: the diverse chromaticities of white dwarfs", Hollands et al. This is Fig. 9: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social

Chromaticity distribution (top) for all white dwarfs within 20 pc of the Sun (points). Our cuts to exclude objects with non-blackbody colours is shown by the grey dashed lines. The correlated colour temperature distribution for the 20 pc sample (excluding three outliers) is shown in the bottom panel, where the colour gradient under the histogram represents the sRGB colour at each given colour temperature, and the panel background is filled with the colour corresponding to the median (#F9F5FF).

@royalastrosoc.bsky.social Oct 14, 2026, 3:15 PMReposted by @rasjournals.bsky.social

There's now just one month left to get applications in for an RAS Research Fellowship. 🔭✍️👨‍🔬

The fellowships provide up to three years of support, with an expected start date of 1 October 2027.

Find out more at www.ras.ac.uk

@rasjournals.bsky.social Oct 14, 2026, 8:15 AM

Published in #MNRAS: "Uncovering the origin of complex velocity distributions in edge-on disc galaxies", Townson et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Mock g-band image of Galaxy 102 viewed face-on (see M. Martig et al. 2012). The galaxy has a strong spiral structure that is excited by the satellite seen on the right of the image.

@rasjournals.bsky.social Oct 14, 2026, 8:08 AM

Published in #GJI Geophysical Journal International: "Insights into water storage response in a humid coastal monsoon region: joint inversion of GNSS and GRACE/GFO observations in Guangdong, China", Liu et al. Visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Study area. (a) Study area and station distribution; a–d denote representative hydrological stations on the four major rivers in Guangdong. (b) Mean annual precipitation over the Pearl River Basin. (c) Seasonal cycles of precipitation and air temperature in Guangdong.

@craiubcterra.bsky.social Oct 13, 2026, 11:43 AMReposted by @rasjournals.bsky.social

#geopapersUB Earthquake recurrence and seismic cycle variability in the Central Apennines from simulated earthquake catalogues. Saghatforoush, K; Pace, B; ...
GEOPHYSICAL JOURNAL INTERNATIONAL 247:2 [2026] doi.org/10.1093/gji/ggag378

@royalastrosoc.bsky.social Oct 13, 2026, 8:00 AMReposted by @rasjournals.bsky.social

Looking for half-term space activities for young children? 🚀🪐 Come celebrate with Dr Sarah Crick at the RAS as she launches her debut book, Mira's Moon! Her launch event workshop will be packed with plenty of family fun and is designed especially for children aged 3 to 7. ⤵️

Promotional poster for "Mira's Moon Mission" by the Royal Astronomical Society showing Dr Sarah Crick holding a colourful space-themed book Mira's Moon, advertising "A magical space adventure for little explorers" on Saturday 24th October for ages 3–7 with Storytime, Moon Mosaics and a family space quiz.

@rasjournals.bsky.social Oct 13, 2026, 8:48 AM

Published in #MNRAS: "Around the water snowline: I. Effects of dynamical and chemical interplay on mid-infrared water spectra of protoplanetary discs", Kaeufer et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Schematic representation of a protoplanetary disc (bottom) with a zoom-in (centre) onto the water snowline. Please visit the paper for the full caption.

@rasjournals.bsky.social Oct 13, 2026, 8:35 AM

Published in #GJI Geophysical Journal International as a Data Note: "Uniform automated analysis of Sdiff splitting due to lowermost mantle anisotropy: caveats and curated global data set", Sun et al. This is Fig. 1: visit academic.oup.com/gji/article/... to read the paper @royalastrosoc.bsky.social

Overview of the ADEPT data set and S_(diff) ray path coverage. Please see the paper for the full caption.

@rasjournals.bsky.social Oct 13, 2026, 8:28 AM

Published in #RASTI RAS Techniques & Instruments: "pyEDITH: the coronagraphic exposure time calculator for the Habitable Worlds Observatory", Alei et al. This is Fig. 1: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Simplified workflow of pyEDITH. Inputs can be provided via command-line configuration files or Python API. Variables are organized into three independent classes (astrophysical scene, observation parameters, observatory configuration) that communicate through a mediator (shaded region). The observatory class is subdivided into telescope, coronagraph, and detector components, typically loaded from standardized HWO files. After validation, the exposure time calculator computes observation times, signal-to-noise ratios, and noise count rates.

@eurospacehistory.bsky.social Oct 13, 2026, 6:42 AMReposted by @rasjournals.bsky.social

#OTD 13 October 1884: Greenwich, UK, was adopted as the prime meridian at International Meridian Conference in Washington DC 🧪 🌐 🌍️

www.royalobservatorygreenwich.org/articles.php...
en.wikipedia.org/wiki/Interna...

@royalastrosoc.bsky.social @astrolibrarian.bsky.social @ukspaceagency.bsky.social

Plaque reading 'PRIME MERIDIAN OF THE WORLD' with coordinates (Latitude 51°28'38" N, Longitude 0°00'00") mounted on a black panel and bisected by a red vertical line marking the prime meridian.

@royalastrosoc.bsky.social Oct 12, 2026, 2:45 PMReposted by @rasjournals.bsky.social

This Friday we'll be hosting our first Specialist Discussion Meetings of the 2026/27 season... 🎉 One will look at what can be done to address the threat to astronomy posed by more satellite constellations, while the other will explore how solar wind controls Earth's radiation belt dynamics.

Royal Astronomical Society poster for a Specialist Discussion Meeting titled 'Dark and Quiet Skies and Satellite Constellations', set on a starfield with satellite streaks; includes 'Book tickets at ras.ac.uk' and details: Friday 16 October, 10:30am–5:00pm, Geological Society, Burlington House,

Poster advertising a Royal Astronomical Society specialist discussion meeting titled "How Does Solar Wind Control Earth's Radiation Belt Dynamics?", scheduled Friday 16 October 10:30am–3:35pm at Burlington House, London, with booking at ras.ac.uk, set on a space-themed background.

@rasjournals.bsky.social Oct 12, 2026, 9:00 AM

Published in #MNRAS: "Life in the cosmic neighbourhood: galactic habitable zones in the EAGLE simulations", Barnes et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The habitable time per unit baryonic mass (top) and per stellar mass (bottom), as a function of cosmic time (top axis) and redshift (bottom axis). Dashed lines show the predictions with no extinction events, while the solid line shows predictions will all extinctions. Please see the paper for the full caption.

@rasjournals.bsky.social Oct 12, 2026, 8:54 AM

Published in #GJI Geophysical Journal International: "Effects of groundwater level variations on seismic ground motion", González et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Variation of the absolute spectral amplitude of vertical (⁠⁠|T_z|) and horizontal (⁠⁠|T_x|) ground motion components as a function of frequency and angle of incidence for an incident S wave.

@rasjournals.bsky.social Oct 12, 2026, 8:47 AM

Published in #RASTI RAS Techniques & Instruments: "Probing exoplanetary chemistry with Ariel: scientific priorities and observational strategies", Venot et al. Please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Forward models for the coolest five planets in our sample, ordered by increasing equilibrium temperature, showing the chemical abundances (left) in chemical equilibrium (dashed) and full chemical kinetics (full), and the synthetic transmission spectra (right) for the equilibrium (orange) and kinetics (blue) case. For the computation of the Ariel uncertainties we assumed a Tier 2-scenario.

@samillingworth.com Oct 12, 2026, 6:23 AMReposted by @rasjournals.bsky.social

🪐 Jupiter's colour sits in one cloud layer

Using six years of telescope images, Oxford researchers found two layers, a main cloud and a haze, explain what we see. The colour comes from the main cloud. Mapped from Earth.

🔗 doi.org/10.1093/mnras/stag1936

#Jupiter #Astronomy #Space 🧪

@royalastrosoc.bsky.social Oct 12, 2026, 7:15 AMReposted by @rasjournals.bsky.social

We're looking for a Publishing Assistant to provide efficient editorial, marketing and administrative support to our publishing team.

The postholder will work across three scientific journals which publish leading research in astronomy and geophysics. 🔭💫🪐

Find out more 👉️ ras.ac.uk/news-and-pre...

@royalastrosoc.bsky.social Oct 9, 2026, 1:21 PMReposted by @rasjournals.bsky.social

Want to hear about some of the weirdest planets ever discovered? 🪐👽️ We're kicking off our 2026/27 Public Talk programme by taking our audience on a tour through some of the most peculiar exoplanets discovered to date – some stranger than those imagined by science fiction. ⤵️

@rasjournals.bsky.social Oct 9, 2026, 8:02 AM

Published in #MNRAS: "Galaxy populations in the IllustrisTNG caustic skeleton", Hertzsch et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The dark and baryonic cosmic web in the TNG100 simulation of the IllustrisTNG suite. Please see the paper for the full caption.

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