Tinia (moon)

Last updated
Tinia
20131105 2002 UX25 hst.png
Hubble Space Telescope image of 55637 Uni and its moon Tinia at 10 o'clock.
Discovery
Discovered by Brown et al.
Discovery dateAugust 2005
Designations
Designation
(55637) Uni I
Named after
 Tinia
Orbital characteristics
4750±40 km [1]
Eccentricity 0.17±0.03 [2]
8.3095 d (prograde) [1]
Inclination 63.1° [1]
Satellite of 55637 Uni
Physical characteristics
105±15 km [3]
Uni + 2.5

    Tinia is the only known natural satellite of the trans-Neptunian object 55637 Uni.

    Contents

    Discovery and naming

    Tinia was discovered in August 2005, by observations with the Hubble Space Telescope, and announced on 22 February 2007. [4] It was named together with Uni on 1 September 2025 after Tinia, the Etruscan sky god and husband of the Etruscan goddess of love and fertility Uni. [5]

    Physical characteristics

    Tinia was discovered at 0.16 arcseconds from Uni with a difference in apparent magnitude of 2.5 [6] Its diameter is estimated at 210±30 km. Assuming an albedo similar to its primary, Tinia should have a diameter of approximately 190 km; [2] assuming an albedo of 0.05, typical of cool classical KBOs of similar size, it should have a diameter of approximately 260 km. [7]

    Orbital characteristics

    A simulated circular orbit of Tinia at a distance of 4,770 km from Uni. 2002 UX25 moon-orbit.png
    A simulated circular orbit of Tinia at a distance of 4,770 km from Uni.

    Tinia completes one complete orbit around Uni every 8.309±0.0002 days, at a distance of 4770±40 km, indicating a total system mass of (1.25±0.03)×1020 kg. [7] [2] Its orbital eccentricity is 0.17±0.03. [2]

    References

    1. 1 2 3 "2002 UX25 System parameters". Will Grundy. Retrieved 2023-08-29.
    2. 1 2 3 4 "(55637) Uni and Tinia". www.johnstonsarchive.net. Retrieved 2025-09-06.
    3. ↑ "(55637) 2002 UX25" . Retrieved 28 July 2023.
    4. ↑ "IAUC 8812: Satellites of 2003 AZ_84, (50000), (55637), (90482); V1281 Sco; V1280 Sco". www.cbat.eps.harvard.edu. Retrieved 2025-09-06.
    5. ↑ "WGSBN Bulletin (Vol. 5, No. 20)" (PDF). IAU. 2025-09-01. p. 6.
    6. ↑ "Αρχειοθετημένο αντίγραφο". Archived from the original on 2007-09-12. Retrieved 2018-10-06.
    7. 1 2 M.E. Brown (2013). "The density of mid-sized Kuiper belt object 2002 UX25 and the formation of the dwarf planets". The Astrophysical Journal Letters. 778 (2): L34. arXiv: 1311.0553 . Bibcode:2013ApJ...778L..34B. doi:10.1088/2041-8205/778/2/L34. S2CID   17839077.
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