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Asteroids with Satellites Database--Johnston's Archive
(55637) Uniand Tinia
compiled by Wm. Robert Johnston
last updated1 September 2025--Orbital and physical data--
(Seethis page for definitions of quantities; source codes in brackets, seethis link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:TNO, Cubewano
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 43.022988 AU | | orbital periodP: | 282.20133 yr
(= 103074.037 d) | | eccentricitye: | 0.1457644 | | perihelion distanceq: | 36.751769 AU | | aphelion distanceQ: | 49.294208 AU | | inclinationi: | 19.3906388° | | argument of perihelionω: | 274.94747° | | ascending nodeΩ: | 204.5573087° | | mean anomalyM: | 309.04577° | | perihelion passageTP: | 2064 Sep 26.050 | | Epoch: | 2024 Oct 17 | | data arc: | 1991-2024(1440 obs.) | | Earth MOID: | 35.8256 AU | | Jupiter Tisserand invariantTJ: | 5.488 | | Neptune Tisserand invariantTN: | 2.931 [*D] |
orbital data, secondary: | semimajor axisas: | 4770± 40 km[B13b] | | separation/primary radiusas/rp: | 14.3 [*D] | | separation/Hill radiusas/rH: | 0.00315 [*D] | | orbital periodPs: | 8.309± 0.0002d [B13b] | | eccentricityes: | 0.17± 0.03[B13b] | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 3.84[MPC]
3.87 ± 0.02 [F13a] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 697.2± 23/24.5 km [F13a] | | geometric albedo: | 0.107± 0.005/0.008[F13a] | | color indexU-B: | 0.26[J07a] | | color indexB-V: | 0.98[J07a] | | color indexV-R: | 0.54 ± 0.03 [J07a] | | color indexB-R: | 1.52 [J07a] | | color indexV-I: | 1.13 ± 0.05 [D07c] | | color indexR-J: | 1.28 [D07c] | | color indexV-J: | 1.82 ± 0.09 [D07c] | | color indexJ-H: | 0.4 ± 0.05 [D07c] | | color indexV-H: | 2.22 [D07c] | | taxonomic type: | RR (G-mode) [P10a] | | massm: | 1.25x1020 ± 3x1018kg [B13b] | | densityρ: | 0.82± 0.11/0.11 g/cm3[B13b] | | Hill radiusrH: | 1500000 km [*D] |
other data, primary: | diameterdp: | 665± 29 km [F13a] | | rotation periodRPp: | 14.382± 0.001h [R05a] | | amplitude in mag., rotationalΔM: | 0.21± 0.06 [R05a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 210± 30km [F13a] | | diameter ratiods/dp: | 0.316± 0.029 [B07d] | | component mag. differenceΔM: | 2.5± 0.2 [I8812] | | rotation periodRPs: | ? | |
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--(55637) Uni and Tinia --discovery and notes:
Primary discovered2002 Oct 30from Kitt Peak Observatory, Arizona, USAby Spacewatch Program.Alternate designation(s):2002 UX25.Linked to prediscovery observations from 1991 Oct 12.Permanent number assigned 2003 Feb 16.
Named 2025 Sep 01 for the Etruscan mythological goddess [WGSBN0520].
Companion discovered2005 Aug 26 by M. E. Brown and T.-A. SuerusingHubble Space Telescope observations from Hubble Space Telescope.Announced2007 Feb 22 [B07d].
Permanent designation I Tinia, assigned 2025 Sep 01; named for the Etruscan mythological god [WGSBN0520].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Brown, M. E. 2013, The Astrophysical JournalThe Density of Mid-sized Kuiper Belt Object 2002 UX25 and the Formation of the Dwarf Planets
- Brown, Michael E. 2013, AAS/Division for Planetary Sciences Meeting AbstractsThe density of mid-sized Kuiper belt object 2002 UX25 and the formation of the dwarf planets
- Fornasier, S., Lellouch, E., Müller, T., Santos-Sanz, P., Panuzzo, P., Kiss, C., Lim, T., Mommert, M., Bockelée-Morvan, D., Vilenius, E., Stansberry, J., Tozzi, G. P., Mottola, S., Delsanti, A., Crovisier, J., Duffard, R., Henry, F., Lacerda, P., Barucci, A., & Gicquel, A. 2013, Astronomy and AstrophysicsTNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of nine bright targets at 70-500 μm
- Fornasier, S., Lellouch, E., Mueller, T., Panuzzo, P., Santos-Sanz, P., Lim, T., Kiss, C., Vilenius, E., Stansberry, J., Delsanti, A., Henry, F., Boehnhardt, H., Pal, A., Duffard, R., & Barucci, A. 2012, EGU General Assembly Conference Abstracts'TNOs are Cool: A survey of the trans-Neptunian region'. Results from the PACS and SPIRE observations with the Herschel Space Observatory
- Fornasier, S., Lim, T., Müller, T., Panuzzo, P., Santos-Sanz, P., Vilenius, E., Boenhardt, H., Stansberry, J., Delsanti, A., Henry, F., Kiss, C., Pal, A., Duffard, R., Barucci, A., & Dotto, E. 2011, EPSC-DPS Joint Meeting 2011Sub-millimeter observations of Centaurs and TNOs from the Herschel space telescope
- Brown, M. E. & Suer, T.-A. 2007, International Astronomical Union CircularSatellites of 2003 AZ_84, (50000), (55637), and (90482)
- Rousselot, P., Petit, J.-M., Poulet, F., & Sergeev, A. 2005, IcarusPhotometric study of Centaur (60558) 2000 EC <SUB>98</SUB> and trans-neptunian object (55637) 2002 UX <SUB>25</SUB> at different phase angles
- Stoss, R., Helin, E. F., Pravdo, S., Lawrence, K. J., Rabinowitz, D. L., Sheppard, S. S., Kervin, P., Maeda, R., Africano, J., Hicks, M., Haver, R., Pelloni, A., Forti, G., Thicksten, R., & Marsden, B. G. 2002, Minor Planet Electronic Circulars2002 UX25
- Descour, A. S., Holvorcem, P. R., Schwartz, M., & Marsden, B. G. 2002, Minor Planet Electronic Circulars2002 UX25
©2007-2014, 2025by Wm. Robert Johnston.
Last modified1 September 2025.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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