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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17733
Message-Id: <20260401070317.789722880338@server.astronomerstelegram.org>
Date: Wed,  1 Apr 2026 03:03:17 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17733							     ATEL #17733

Title:	Detection of OH 18 cm lines in 3I/ATLAS with FAST
Author:	Jiang D.(GZU), Qian L.(NAOC), Pan Z.(NAOC), Sun C.(NAOC),
		Yang Q.(NAOC), Huang M.(NAOC), Hao Q.(NAOC), Wang X.(NAOC), Guo M.(NAOC),
		Zhao L.(NAOC), Zhao Y.(NAOC), Jiang P.(NAOC)
Queries:	gs.dyjiang23@gzu.edu.cn;dongyue5@qq.com
Posted:	31 Mar 2026; 08:02 UT
Subjects:Radio, Comet

We conducted observations of the third interstellar object to enter the
Solar System, 3I/ATLAS, using the ultra-wideband receiver of the FAST telescope.
The observation was done with the user-defined mode with a total integration
time of 50 min per epoch. The observations were carried out on 2025 November
19 01:14-02:04, November 20 00:35-01:25, November 30 23:32-00:22, December
2 00:23-01:13, and December 3 23:06-23:56 (UT).  
The absorption and emission were detected in the OH 1667 MHz line on November
19, December 1, and December 2. The corresponding line-of-sight velocities
and integrated intensity are -22.6+/-0.3 km/s, -0.38+/-0.09 K km/s; -19.0+/-0.1
km/s, 0.19+/-0.05 K km/s; and -18.2+/-0.2 km/s, 0.41+/-0.09 K km/s, respectively.
These values are consistent with the topocentric velocities -22.6 km/s,
-18.9 km/s and -18.2 km/s, which derived from the JPL Horizons system.

The main OH 18 cm line profiles of 3I/ATLAS: https://img.remit.ee/api/file/BQACAgUAAyEGAASHRsPbAAESc5ppy3lfiOCO01sxOZS1I73sO5LmpAACbiIAAgJ4YVZIjBHC-AigDzoE.pdf
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Password Certification: Tong Liu (tongliu@bao.ac.cn)
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