Discovery certificate for object 2004iv
TNS Astronomical Transient Report No. 32736 [ 2019TNSTR.535....1T ]

Date Received (UTC): 2019-04-10 16:48:23
Sender: Ms. Melina Thévenot
Reporting Group: None     Discovery Data Source: None

Melina Thévenot report/s the discovery of a new astronomical transient.

IAU Designation: AT 2004iv
Coordinates (J2000): RA = 18:51:08.024 (282.783434) DEC = -00:44:48.51 (-0.746807)
Discovery date: 2004-04-22 16:58:26.000 (JD=2453118.2072454)

Remarks: Archival images from GLIMPSE (Spitzer IRAC) show an infrared transient of unknown nature in the galactic plane. The transient was first discovered by the volunteer Julio Albornoz in the Milky Way Project (here:, which is an astronomy citizen science project. Spitzer MIPS [24] show a source at the same position from 2005-10-02, but WISE images don't show any source at this position in 2010. Grace Wolf-Chase from the Adler Planetarium took part of the discussion as a researcher. Many thanks to Richard Nowell and Alexander Jonkeren for helping me with APT.


Discovery (first detection):
Discovery date: 2004-04-22 16:58:26.000
Flux: 6.10681 ABMag
Filter: 3.6-Spitzer IRAC
Instrument: IRAC
Telescope: The Spitzer Space Telescope

Remarks: Magnitude of the transient was calculated with APT by Melina Thévenot, using GLIMPSE G032.2144-00.2946 as a reference star. Observer was copied from the image header of the fits file, acquired with IRSA. Exposure time is the average exposure time from the image header.

Last non-detection:
Archival info: Other
Remarks: WISE (Allwise) does not show any source with compareable brightness at this position in 2010.

Details of the new object can be viewed here: