# April 2017 Observations ### **SPT** ![20170203_220721](/sites/g/files/omnuum3116/files/2024-10/20170203_220721.jpg) The SPT EHT team during test VLBI observations between SPT and APEX, Feb 2017 (Left to right: Andre Young, Dan Marrone, Daniel Michalik, Junhan Kim, Andrew Nadolski), photo: Junhan Kim ### **SPT Auroras** ![spt_auroras](/sites/g/files/omnuum3116/files/2024-10/spt_auroras.jpg) The South Pole Telescope illuminated by aurora australis and the Milky Way. Jupiter is brightly visible on the lower left, Saturn is located to the right of the telescope. The outside temperature is -60°C. Photo: Daniel Michalik / South Pole Telescope ### **SPT** ![spt5](/sites/g/files/omnuum3116/files/2024-10/spt5.jpg) Junhan checking the EHT setup in the South Pole Telescope receiver electronics rack. Photo: Daniel Michalik / South Pole Telescope ### **SPT preparation** ![spt4](/sites/g/files/omnuum3116/files/2024-10/spt4.jpg) The South Pole Telescope in docking position during EHT preparations in January 2017. Photo: Daniel Michalik / South Pole Telescope ### **SPT** ![spt3](/sites/g/files/omnuum3116/files/2024-10/spt3.jpg) SPT scientists Dan, Wendy, Junhan, and Tom working on improvements to the EHT setup on the South Pole Telescope. Photo: Daniel Michalik / South Pole Telescope ### **SPT Full Moon** ![spt_full_moon](/sites/g/files/omnuum3116/files/2024-10/spt_full_moon.jpg) The South Pole Telescope illuminated by the Full Moon and exceptionally bright aurora australis. Photo: Daniel Michalik / South Pole Telescope ### **SPT** ![spt1](/sites/g/files/omnuum3116/files/2024-10/spt1.jpg) Wendy carrying the tertiary EHT mirror up to the cabin roof of the South Pole Telescope for a test run. Photo: Daniel Michalik / South Pole Telescope ### **SPT** ![spt6](/sites/g/files/omnuum3116/files/2024-10/spt6.jpg) SPT winter-over scientists Daniel and Andrew in control of the South Pole Telescope during EHT observations. Photo: Rick Osburn and Daniel Michalik / South Pole Telescope ### **SPT** ![spt7](/sites/g/files/omnuum3116/files/2024-10/spt7.jpg) Daniel repairing one of the South Pole Telescope's EHT Mark 6 data recorders. Photo: Andrew Nadolski and Daniel Michalik / South Pole Telescope ### **SPT** ![spt_01](/sites/g/files/omnuum3116/files/2024-10/spt_01.jpg) Dan working on the South Pole Telescope EHT electronics inside the telescope receiver cabin. Photo: Daniel Michalik / South Pole Telescope ### **SPT** ![spt2](/sites/g/files/omnuum3116/files/2024-10/spt2.jpg) Andrew and Daniel on top of the South Pole Telescope receiver cabin. The picture shows the two SPT winter-over scientists after just having finished mounting the EHT optics in -60°C and darkness. Photo: Eric Hansen / South Pole Telescope ### **SPT** ![spt](/sites/g/files/omnuum3116/files/2024-10/spt.jpg) SPT winter-over scientists Andrew and Daniel getting ready to mount the EHT optics onto the South Pole Telescope. Photo: Eric Hansen / South Pole Telescope ### **Cambridge, MA** ![img_5773](/sites/g/files/omnuum3116/files/2024-10/img_5773.jpg) At the Black Hole Initiative in Cambridge, MA during observations. Left to right: Lia Medeiros, Shep Doeleman, Kazunori Akiyama, Vincent Fish, Jim Moran, Feryal Ozel ### **LMT Sunrise** ![170409lmtsunrises2](/sites/g/files/omnuum3116/files/2024-10/170409lmtsunrises2.jpg) LMT at sunrise. Credit: Ana Torres Campos ### **LMT** ![170403lmt2](/sites/g/files/omnuum3116/files/2024-10/170403lmt2.jpg) LMT. Credit: Ana Torres Campos ### **LMT** ![dsc00882](/sites/g/files/omnuum3116/files/2024-10/dsc00882.png) LMT. Credit: David Sanchez-Arguelles (LMT/INAOE) ### **LMT Group** ![170402group32](/sites/g/files/omnuum3116/files/2024-10/170402group32.jpg) LMT group. Left to right: Aleksandar Popstefanija, Michael Janssen, Sandra Bustamante, Lindy Blackburn, Katie Bouman, Gopal Narayanan, and Edgar Castillo. Credit: Ana Torres Campos ### **LMT** ![dsc_01272](/sites/g/files/omnuum3116/files/2024-10/dsc_01272.jpg) LMT. Back row, left to right: Katie Bouman (MIT), Ana Torres-Campos (LMT/INAOE) and Lindy Blackburn (CfA). Front: David Sanchez-Arguelles (LMT/INAOE). Credit: David Sanchez-Arguelles (LMT/INAOE) ### **LMT Countdown** ![eht_finalcountdown](/sites/g/files/omnuum3116/files/2024-10/eht_finalcountdown.png) Celebration at LMT after an observation run. Left to right: Antonio Hernández, Sergio Dzib, Emir Moreno, Edgar Castillo, Gopal Narayanan, Katie Bouman, and Sandra Bustamante. Credit: Ana Torres Campos ### **LMT Control** ![control](/sites/g/files/omnuum3116/files/2024-10/control.jpg) LMT telescope controlers/observers David Sánchez (left) and Edgar Castillo (Right). Credit: Ana Torres Campos ### **LMT** ![pasted_image_at_2017_04_05_20_08](/sites/g/files/omnuum3116/files/2024-10/pasted_image_at_2017_04_05_20_08.png) LMT cam. Credit: LMT/INAOE ### **LMT Site** ![20170409_070135_01](/sites/g/files/omnuum3116/files/2024-10/20170409_070135_01.jpg) LMT site. Credit: Lindy Blackburn ### **LMT Group** ![20170413_170718](/sites/g/files/omnuum3116/files/2024-10/20170413_170718.jpg) LMT Group. Left to right: Michael Janßen, Aleks Popstefanija, Lindy Blackburn, Sandra Bustamante, Katie Bouman. Credit: Lindy Blackburn ### **LMT** ![img_0887](/sites/g/files/omnuum3116/files/2024-10/img_0887.jpg) LMT. Credit: Katie Bouman ### **SMA** ![img_20170404_133331](/sites/g/files/omnuum3116/files/2024-10/img_20170404_133331.jpg) Jonathan at SMA. Credit: Atish Kamble ### **SMA Control Room** ![img_20170404_135007](/sites/g/files/omnuum3116/files/2024-10/img_20170404_135007.jpg) SMA control room. Left to right: Tony, Jonathan, and Andre. Credit: Atish Kamble ### **CMT Team** ![JCMTTeam](/sites/g/files/omnuum3116/files/2024-10/JCMTTeam.jpg) JCMT. Mareki, Remo, Jim, Kevin S., Kevin K., and Satoki below. Credit: Satoki Matsushita (ASIAA) ### **IRAM Pico Veleta Team** ![img_9078](/sites/g/files/omnuum3116/files/2024-10/img_9078.jpg) Pico Veleta team in front of VLBI recorders. Left to right: Pablo Torne, Salvador Sanchez, Heino Falcke, Rebecca Azulay, T. Krichbaum, Ignacio Ruiz. Credit: T. Krichbaum ### **IRAM** ![IRAMcables](/sites/g/files/omnuum3116/files/2024-10/IRAMcables.jpg) Cabling of the VLBI backends at the IRAM 30m telescope. Credit: T. Krichbaum ### **APEX Crew** ![img_2885-2](/sites/g/files/omnuum3116/files/2024-10/img_2885-2.jpg) The APEX crew. Standing (from left to right): Mariano Diaz, Juan Pablo Araneda, Michael Dumke, Thomas Klein, Miroslaw Ciechanowicz, Jorge Ramirez & Karl Torstensson. Sitting (from left to right): Venkatessh Ramakrishnan, Neil Nagar, Alan Roy & Sven Dornbusch. Credit: Venkatessh Ramakrishnan ### **SMT** ![smt-3](/sites/g/files/omnuum3116/files/2024-10/smt-3.png) SMT. Left to right: Dan Marrone (University of Arizona), Junhan Kim (University of Arizona). Credit: Junhan Kim (University of Arizona) ### **SMT** ![smt-2](/sites/g/files/omnuum3116/files/2024-10/smt-2.png) SMT. Left to right: Christian Holmstedt (University of Arizona), Freek Roelofs (Radboud University), Dan Marrone (University of Arizona), Sara Issaoun (Radboud University). Credit: Junhan Kim (University of Arizona) ### **SMT** ![smt-1](/sites/g/files/omnuum3116/files/2024-10/smt-1.png) SMT. Left to right: Sara Issaoun (Radboud University), Freek Roelofs (Radboud University), Junhan Kim (University of Arizona), Christian Holmstedt (University of Arizona). Credit: Junhan Kim (University of Arizona) ### **SMT** ![smt_under_moonlight](/sites/g/files/omnuum3116/files/2024-10/smt_under_moonlight.jpg) SMT under moonlight. Credit: Junhan Kim (University of Arizona) ### **SMT** ![img_9022_re](/sites/g/files/omnuum3116/files/2024-10/img_9022_re.jpg) SMT. Credit: Junhan Kim (University of Arizona) ### **SMT** ![smt_and_lbtree](/sites/g/files/omnuum3116/files/2024-10/smt_and_lbtree.jpg) SMT. Credit: Junhan Kim (University of Arizona) ### **APEX Antenna** ![APEXantenna](/sites/g/files/omnuum3116/files/2024-10/APEXantenna.jpg) APEX antenna. Credit: Sven Dornbusch ### **SMT** ![synchrotron_squirrels](/sites/g/files/omnuum3116/files/2024-10/synchrotron_squirrels.jpg) At the SMT. Left to right: Sara Issaoun, Junhan Kim, and Freek Roelofs. Credit: Freek Roelofs ### **Sara at SMT** ![20170405_165356](/sites/g/files/omnuum3116/files/2024-10/20170405_165356.jpg) Sara Issaoun at the SMT dish. Credit: Freek Roelofs ### **VLBI Team at SMA** ![vlbi_team9april](/sites/g/files/omnuum3116/files/2024-10/vlbi_team9april.jpg) VLBI team at SMA, April 9 2017. Left to right: Geoff, Remo, André, Jonathan. Credit: Jonathan Weintroub. ### **SMT Trees** ![37_1024](/sites/g/files/omnuum3116/files/2024-10/37_1024.jpg) SMT and its infamous trees. Credit: Sara Issaoun, grad student at Radboud University in Netherlands. ### **SMA Team** ![sma_team](/sites/g/files/omnuum3116/files/2024-10/sma_team.jpg) SMA team. Front row, left to right: Paul Yamaguchi, Remo Tilanus. Back row: Jonathan Weintroub, André Young, Atish Kamble. Credit: photo taken by Roshan Samarasinghe, courtesy of Jonathan Weintroub ### **SMA Full Moon** ![sma_fullmoon3c27911april](/sites/g/files/omnuum3116/files/2024-10/sma_fullmoon3c27911april.jpg) SMA by the light of the full moon observing 3C279, April 10, HST. Credit: Jonathan Weintroub ### **Pico Veleta** ![pico-veleta-30m-11apr2017](/sites/g/files/omnuum3116/files/2024-10/pico-veleta-30m-11apr2017.jpeg) Pico Veleta with the IRAM 30m telescope, taken from Granada. Credit: Carsten Kramer (IRAM) ### **Pico Veleta VLBI Crew** ![pico_eht_crew](/sites/g/files/omnuum3116/files/2024-10/pico_eht_crew.jpg) IRAM's Pico Veleta VLBI crew. From left to right, Salvador, Rebecca, Ignazio, Heino, Thomas. Credit: Salvador Sanchez ### **Large Millimeter Telescope** ![img_20170410_184407](/sites/g/files/omnuum3116/files/2024-10/img_20170410_184407.jpg) Large Millimeter Telescope (LMT). Credit: Aleks PopStefanija ### **Pico Near LMT** ![img_20170409_070506792_hdr](/sites/g/files/omnuum3116/files/2024-10/img_20170409_070506792_hdr.jpg) This is what we call 'Pico' here near the LMT (Pico de Orizaba / Citlaltépetl). Credit: Michael Janssen, Radboud University Nijmegen, The Netherlands ### **IRAM's Pico Team** ![pico_eht_team_3_2017](/sites/g/files/omnuum3116/files/2024-10/pico_eht_team_3_2017.jpg) IRAM's Pico team. Left to right: Thomas Krichbaum, Pablo Torne, Heino Falke, Salvador Sanchez, Rebecca Azulay, Ignacio Ruiz, Joaquin Santiago. Missing: Helge Rottmann, closely joined to the Pico team, but was in Alma by time of photo. Credit: Salvador Sanchez ### **IRAM Pico Team** ![pico_eht_team_2_2017](/sites/g/files/omnuum3116/files/2024-10/pico_eht_team_2_2017.jpg) IRAM's Pico team. Back, left to right: Pablo Torne, Heino Falke, Ignacio Ruiz. Front, left to right: Salvador Sanchez, Rebecca Azulay, Thomas Krichbaum. Missing: Helge Rottmann, closely joined to the Pico team, but was in Alma by time of photo. Credit: Salvador Sanchez ### **Morning at ALMA** ![ehtc-dawn-5.jpg](/sites/g/files/omnuum3116/files/2024-10/ehtc-dawn-5.jpg.png) Sun up at ALMA. Credit: ALMA ### **APEX Crew** ![img_2877](/sites/g/files/omnuum3116/files/2024-10/img_2877.jpg) APEX group. From left to right: Venkatessh, Neil, Alan & Sven. Credit: Venkatessh Ramakrishnan ### **ALMA Group** ![img_4353-bearbeitet](/sites/g/files/omnuum3116/files/2024-10/img_4353-bearbeitet.png) Fun at ALMA. Left to right: Helge, Violette, Ciriaco, and Geoff. Credit: Helge Rottmann ### **ALMA Eureka!** ![ALMAeureka](/sites/g/files/omnuum3116/files/2024-10/ALMAeureka.jpg) Eureka at ALMA! From left to right: Helge Rottmann (MPIfR/EHT Team), Paulo Cortez (JAO/AoD), Hector Alarcon (JAO/Operator), Daniela Soto (JAO/Operator). Credit: G.B. Crew ### **ALMA at dawn** ![ehtc-dawn-1.jpg](/sites/g/files/omnuum3116/files/2024-10/ehtc-dawn-1.jpg.png) Dawn at ALMA on our last day. Credit: ALMA. ### **SMT** ![SMT1](/sites/g/files/omnuum3116/files/2024-10/SMT1.jpg) SMT at 10,500 feet on Mt. Graham, Arizona. Credit: Sara Issaoun, grad student at Radboud University in Netherlands. ![Junhan_at_SMT](/sites/g/files/omnuum3116/files/2024-10/Junhan_at_SMT.jpg) Junhan bringing the precious modules down from the receiver room at SMT. Credit: Sara Issaoun, grad student at Radboud University in Netherlands.