Discoveries
The project uses a pipeline called HARVEST, which compares metadata from astronomical image archives with the data from the Minor Planet Center and produces images at positions of minor planets. It also excludes images with no detection or images that cannot detect asteroids. [8] Since February 2024 the team also used a Convolutional Neural Network (CNN), called TailNet, to filter out bad images before they are shown to volunteers and to identify high-likely candidates. This CNN uses classification-labels made by the volunteers and is constantly improved with new classifications. [9] One of the first discovery was made in September 2022, when the team published a paper describing that 282P/(323137) 2003 BM80 showed sustained activity over 15 months in 2021-2022. Activity was previously reported in 2012-2013 and the team analysed the orbit, finding that it is an outbursting quasi-Hilda object. [3] The object 2010 LH15 was discovered to have cometary activity from DECam images by the Active Asteroids project. [10] A follow-up study did find activity in images of the Zwicky Transient Facility and showed that the object had a radius of 1.11±0.02 km. The study also showed that the activity was likely due to sublimation. The activity did onset at 1.86 astronomical units (AU), which is closer than other main-belt comets. The researchers find that sublimating volatiles must be buried deeper than on other active asteroids showing sublimation. [11]
List of discoveries
| Name | family | type of activity | year-month of discovery | Reference | Previous discovery of activity |
|---|---|---|---|---|---|
| 2015 TC1 | Jupiter-family comet | 2022-01 | [8] [2] | no | |
| 2017 QN84 | Jupiter-family comet | 2022-01 | [8] [2] | no | |
| 282P | quasi-Hilda object (former Centaur or Jupiter-family comet) | volatile sublimation | 2013-06/2022-09 | [3] | yes, Bolin et al. [12] |
| 2015 FW412 | main-belt comet candidate | sublimation | 2023-02 | [13] [2] | no |
| 2015 VA108 | main-belt comet candidate | volatile sublimation | 2023-02 | [14] | no |
| 2009 DQ118 | quasi-Hilda object (former Jupiter family comet or Centaur) | sublimation of volatile ices | 2023-03 | [15] [16] | no |
| 2010 LH15 (aka 2010 TJ175) | main-belt comet | likely sublimation [11] | 2023-03 | [10] | no |
| (588045) 2007 FZ18 | main-belt comet candidate | two tails | 2023-05 | [17] | no |
| 2018 CZ16 | quasi-Hilda object | thermally driven activity indicative of water-ice sublimation | 2023-05 | [18] | no |
| P/2005 XR132 [19] | Jupiter-family comet | 2021-04/2023-07 | [20] [21] | yes, Cheng et al. [22] | |
| 2004 CV50 | quasi-Hilda object | 2023-11 | [23] | no | |
| (551023) 2012 UQ192 | Jupiter-family Comet | recurrently active, sublimation | 2023-12 | [24] [2] | no |
| 2019 OE31 | vacationing Centaur | volatile sublimation | 2023-12 | [25] | no |
| 2008 QZ44 | Jupiter-family comet | 2023-12 | [26] | no | |
| 2018 VL10 | Jupiter-family comet (Mars crossing) | 2023-12 | [27] | no | |
| 2018 OR | Jupiter-family comet (Mars crossing) | 2024-01 | [28] [2] | no | |
| (410590) 2008 GB140 | main-belt comet candidate | 2024-02 | TailNet identified activity [29] | no | |
| 2016 UU121 | main-belt comet candidate | 2024-02 | TailNet identified activity [9] | no | |
| 2011 UG104 | Jupiter-family comet | 2024-05 | TailNet identified activity [30] | no | |
| 2015 VP51 | Jupiter-family comet | suspected sublimation | 2024-09 | TailNet filtered, identified by citizen scientists [31] | no |
| 2010 MK43 (aka 2010 RA78) | Jupiter-family comet (former quasi-Hilda object) | 2024-09 | TailNet filtered, identified by citizen scientists [32] | no | |
| (523822) 2012 DG61 | Near-Earth Comet and Apollo asteroid | recurrently active, likely sublimation | 2018-05/2025-01 | TailNet identified activity [33] | previously observed by G. Borisov [33] |