Moon of 532037 Chiminigagua
| File:Chiminigagua Hubble 2018 annotated moon label.gif Time-lapse animation of Chiminigagua's moon (yellow arrow) orbiting back and forth, as seen by the Hubble Space Telescope from January to July 2018 | |
| Discovery[2] | |
|---|---|
| Discovered by | Scott S. Sheppard[1] |
| Discovery site | Hubble Space Telescope |
| Discovery date | 15 January 2018 |
| Orbital characteristics[2] | |
| >9800±40 km | |
| ≈19 d (for assumed density 1.6 g/cm3)[3] | |
| Satellite of | 532037 Chiminigagua |
| Physical characteristics | |
Mean diameter | 186+25 −26 km (assuming same albedo)[2] |
| Albedo | 0.170+0.045 −0.030 (assumed)[2] |
| 25.5[4] | |
| 6.15[lower-alpha 1] | |
532037 Chiminigagua, a large scattered disc object, has a single known natural satellite, or moon, which as of 2025[update] has no official designation or name.[5] Chiminigagua may be considered a binary system, where Chiminigagua is the primary component and the moon is the secondary component.[3] The moon was discovered by Scott Sheppard using the Hubble Space Telescope's Wide Field Camera 3 on 15 January 2018, whose high-resolution images revealed it as a faint dot next to Chiminigagua.[2]:9 Sheppard reported the moon to the International Astronomical Union,[2]:9 which announced the discovery on 10 August 2018 via the Central Bureau for Astronomical Telegrams.[1]
Physical characteristics
The moon is 3.0±0.2 magnitudes fainter than Chiminigagua, which suggests it has a diameter between 160 and 210 km (99 and 130 mi) (about 1/4 of Chiminigagua's diameter), if the moon's albedo is the same as Chiminigagua's.[3][2]:9 Compared to other mid-sized TNOs with moons, the secondary-to-primary diameter ratio of the Chiminigagua system is relatively small.[2]:10 The relatively small size and orbit of Chiminigagua's moon suggests it likely formed from a giant impact on Chiminigagua, similar to the small moons of the larger dwarf planets.[2]:10
Observations
Although Chiminigagua's moon has been observed multiple times by the Hubble Space Telescope from January to July 2018, the exact details of its orbit are still unknown.[4][6] These Hubble observations from 2018 showed that the moon orbits relatively close to Chiminigagua, at least 9,800 km (6,100 mi) away (0.17 arcseconds in angular separation)[2]:9 but no farther than 0.25 arcseconds.[7] The orbit of Chiminigagua's moon is oriented edge-on from Earth's perspective, which means that the moon can pass in front of or behind Chiminigagua and thus evade detection.[7][6] The Hubble Space Telescope is scheduled to observe Chiminigagua and its moon in December 2025, which should be able to determine the moon's orbit.[6]
Notes
References
- ↑ 1.0 1.1 Green, Daniel W. E. (10 August 2018). "CBET 4537: 2013 FY27". Central Bureau Electronic Telegram. Central Bureau for Astronomical Telegrams. Bibcode:2018CBET.4537....1S. Retrieved 9 September 2018.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Sheppard, Scott; Fernandez, Yanga; Moullet, Arielle (6 September 2018). "The Albedos, Sizes, Colors and Satellites of Dwarf Planets Compared with Newly Measured Dwarf Planet 2013 FY27". The Astronomical Journal. 156 (6): 270. arXiv:1809.02184. Bibcode:2018AJ....156..270S. doi:10.3847/1538-3881/aae92a. Unknown parameter
|s2cid=ignored (help) - ↑ 3.0 3.1 3.2 Johnston, Wm. Robert (2019-05-27). "(532037) 2013 FY27". Johnston's Archive. Retrieved 2023-01-03.
- ↑ 4.0 4.1 4.2 Grundy, Will (2025-08-22). "Chiminigagua (532037 2013 FY27)". Lowell Observatory. Retrieved 2025-09-15.
- ↑ "JPL Small-Body Database Lookup: 532037 Chiminigagua (2013 FY27)" (2025-02-22 last obs.). Jet Propulsion Laboratory. Retrieved 2025-08-15.
- ↑ 6.0 6.1 6.2 Ragozzine, Darin (2025-08-22). "Probing the TNO Density Transition with Mid-Size 2013 FY27". Mikulski Archive for Space Telescopes. Space Telescope Science Institute: HST Proposal 18133. Bibcode:2025hst..prop18133R. Cycle 33. Retrieved 2025-08-16.
- ↑ 7.0 7.1 Nelsen, Maia; Ragozzine, Darin; Giforos, William; Proudfoot, Benjamin; Sheppard, Scott S.; Grundy, William (December 2022). Constraints on the Orbit of the Moon of Mid-Size TNO 2013 FY27. AAS Division of Planetary Science meeting #54. 54. Bibcode:2022DPS....5441006N. 410.06.
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