James Webb Space Telescope Feed

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F210M) Meta Release: 8/28/2022 1:11:24 PM Last Modified: 8/29/2023 12:23:10 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:48:41 PM Last Modified: 8/29/2023 12:23:05 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:48:41 PM Last Modified: 8/29/2023 12:23:05 AM Proposal ID: 1257 (Archived)

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Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F335M) Meta Release: 8/28/2022 1:17:51 PM Last Modified: 8/29/2023 12:23:00 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F335M) Meta Release: 8/28/2022 1:17:51 PM Last Modified: 8/29/2023 12:23:00 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:23:13 PM Last Modified: 8/29/2023 12:22:55 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:23:13 PM Last Modified: 8/29/2023 12:22:55 AM Proposal ID: 1257 (Archived)

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Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:23:48 PM Last Modified: 8/29/2023 12:22:50 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:23:48 PM Last Modified: 8/29/2023 12:22:50 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:23:48 PM Last Modified: 8/29/2023 12:22:45 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:23:48 PM Last Modified: 8/29/2023 12:22:45 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:23:13 PM Last Modified: 8/29/2023 12:22:40 AM Proposal ID: 1257 (Archived)

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Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:23:13 PM Last Modified: 8/29/2023 12:22:40 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F210M) Meta Release: 8/28/2022 1:06:02 PM Last Modified: 8/29/2023 12:22:36 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F210M) Meta Release: 8/28/2022 1:06:02 PM Last Modified: 8/29/2023 12:22:36 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F444W;F466N) Meta Release: 8/28/2022 12:12:42 PM Last Modified: 8/29/2023 12:22:31 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F444W;F466N) Meta Release: 8/28/2022 12:12:42 PM Last Modified: 8/29/2023 12:22:31 AM Proposal ID: 1257 (Archived)

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Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:20:32 PM Last Modified: 8/29/2023 12:22:25 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:20:32 PM Last Modified: 8/29/2023 12:22:25 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:56:54 PM Last Modified: 8/29/2023 12:22:20 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:56:54 PM Last Modified: 8/29/2023 12:22:20 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:32:02 PM Last Modified: 8/29/2023 12:22:15 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:32:02 PM Last Modified: 8/29/2023 12:22:15 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:17:51 PM Last Modified: 8/29/2023 12:22:10 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F162M) Meta Release: 8/28/2022 1:17:51 PM Last Modified: 8/29/2023 12:22:10 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:16:49 PM Last Modified: 8/29/2023 12:22:05 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:16:49 PM Last Modified: 8/29/2023 12:22:05 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:48:41 PM Last Modified: 8/29/2023 12:21:59 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F212N) Meta Release: 8/28/2022 12:48:41 PM Last Modified: 8/29/2023 12:21:59 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:04:29 PM Last Modified: 8/29/2023 12:21:54 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:04:29 PM Last Modified: 8/29/2023 12:21:54 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F210M) Meta Release: 8/28/2022 1:06:02 PM Last Modified: 8/29/2023 12:21:48 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F210M) Meta Release: 8/28/2022 1:06:02 PM Last Modified: 8/29/2023 12:21:48 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:32:02 PM Last Modified: 8/29/2023 12:21:43 AM Proposal ID: 1257 (Archived)

Date: 8/29/2023

Target Name: HH211NIRCAM Title: The Young Protostellar Outflow HH211 Instrument: NIRCAM/IMAGE (F150W2;F164N) Meta Release: 8/28/2022 12:32:02 PM Last Modified: 8/29/2023 12:21:43 AM Proposal ID: 1257 (Archived)

Date: 8/24/2023

Mark McCaughrean | For that, you need to see the context. HH211 is in the constellation of Persus, next to an object called IC348-IR, a bright infrared source discovered in the 1970s. Both HH211 & IC348-IR are seen in the small inset image. In turn, IC348-IR is named for the adjacent IC348 young stellar cluster to its north-east, to the upper left in the wider visible image.

Date: 8/24/2023

Mark McCaughrean | But because we have been watching HH211 for many years, we can also watch how the jet is expanding over time. Here's a comparison between the 2002 VLT 2.12 micron image & the 2022 JWST one at the same wavelength. The expansion is clear, even despite the change in spatial resolution. The jet is expanding at about 100km/s overall, but seems to be decelerating towards the top-left (NW) end, perhaps as the jet crashes into denser material in the region.

Date: 8/24/2023

Full resolution image of Herbig-Haro 211

Date: 8/24/2023

Nature Astronomy | The proper motions of HH211 over two decades. This video compares our JWST NIRCam 2.12 micron image of HH 211 with a corresponding one from a European Southern Observatory 8m-class telescope. The time difference is two decades and motion in the outflow is clearly observed. Note also the superior resolution achieved from space.

Date: 8/24/2023

Mark McCaughrean | The work on comparing the VLT & JWST images & measuring the proper motions to get the velocities was done as part of a master's thesis by Merel Reitsma from Leiden University who worked with me here at ESTEC over the last year as part of a joint programme between the university & ESA. Merel is a co-author on the Nature paper as a result. Here's the relevant plot from her thesis.

Date: 8/24/2023

Mark McCaughrean | And as teased yesterday, I can finally reveal the fourth panel in the sequence of images we've been taking of HH211 over the years, following our discovery of it in 1990. As we've gone to bigger & better telescopes, things have improved, not least now with a large, cold, diffraction-limited telescope at L2

$Mark McCaughrean | And as teased yesterday, I can finally reveal the fourth panel in the sequence of images we've been taking of HH211 over the years, following our discovery of it in 1990. As we've gone to bigger & better telescopes, things have improved, not least now with a large, cold, diffraction-limited telescope at L2$

Date: 8/24/2023

Mark McCaughrean | It's paper time! The first results from my # JWST time, in a project shared with Tom Ray et al. from the MIRI consortium, a study of the extremely young protostellar outflow, HH211, in Perseus, published in advance form in Nature today. https://www. nature.com/articles/s41586-023 -06551-1 Here's the headline image, a composite of three of the NIRCam filters we used. # Astrodon # SpaceScience

The James Webb Space Telescope Feed