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(145480) 2005 TB190, provisionally known as 2005 TB190, is a trans-Neptunian object (TNO) with an absolute magnitude of 4.4,[1] making it a likely dwarf planet.[6]

(145480) 2005 TB190
Discovered byBecker, A. C., Puckett, A. W., Kubica, J at Apache Point (705)
Discovery date11 October 2005
MPC designation(145480) 2005 TB190
Ext-SDO (DES)[2]
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc5041 days (13.80 yr)
Aphelion104.14 AU (15.579 Tm) (Q)
Perihelion46.197 AU (6.9110 Tm) (q)
75.166 AU (11.2447 Tm) (a)
Eccentricity0.38540 (e)
651.69 yr (238031 d)
359.520° (M)
0° 0m 5.445s / day (n)
Inclination26.5376° (i)
180.4280° (Ω)
171.47° (ω)
Earth MOID45.1927 AU (6.76073 Tm)
Jupiter MOID41.2446 AU (6.17010 Tm)
Physical characteristics
Dimensions464±62 km[3]
372.5±37.5 km[4]
12.68 h (0.528 d)
12.68 hours
0.12–0.20 [4]
4.40±0.11 ,[3] 4.6[1]



(145480) 2005 TB190 is located near the "gap", a poorly understood region.

(145480) 2005 TB190 is classified as scattered-extended by the Deep Ecliptic Survey (DES), because its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.[2] However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity. The aphelion of (145480) 2005 TB190 lies at 104 AU.[4]

Simulations by Emel’yanenko and Kiseleva in 2007 showed that (145480) 2005 TB190 appears to have less than a 1% chance of being in a 4:1 resonance with Neptune.[7]

It has been observed 202 times over seven oppositions.[1] It will come to perihelion in January 2017.[1] There are precovery observations dating back to November 2001.

Physical propertiesEdit

In 2010, thermal flux from (145480) 2005 TB190 in the far-infrared was measured by the Herschel Space Telescope. As a result, its size was estimated to lie within a range from 335 to 410 km.[4]

In the visible light, (145480) 2005 TB190 has a moderately red spectral slope.[5]

The TNO was found in 2009 to have a rotation period of 12.68 ±3 hours, a common value for trans-Neptunian objects of its size. Similarly-sized (120348) 2004 TY364 has a rotation period of 11.7 ± 3 hours.


  1. ^ a b c d e f "JPL Small-Body Database Browser: 145480 (2005 TB190)" (2008-08-29 last observation used). Retrieved 7 April 2016.
  2. ^ a b Marc W. Buie (2008-08-29). "Orbit Fit and Astrometric record for 145480". SwRI (Space Science Department). Retrieved 2009-01-24.
  3. ^ a b c Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. (2012). “TNOs are Cool”: A Survey of the Transneptunian Region IV - Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS arXiv:1202.1481
  4. ^ a b c d Muller, T.G.; Lellouch, E.; Stansberry, J.; et al. (2010). ""TNOs are Cool": A survey of the trans-Neptunian region I. Results from the Herschel science demonstration phase (SDP)". Astronomy and Astrophysics. 518: L146. arXiv:1005.2923. Bibcode:2010A&A...518L.146M. doi:10.1051/0004-6361/201014683.
  5. ^ a b Sheppard, Scott S. (2010). "The colors of extreme outer Solar System objects". The Astronomical Journal. 139 (4): 1394–1405. arXiv:1001.3674. Bibcode:2010AJ....139.1394S. doi:10.1088/0004-6256/139/4/1394.
  6. ^ "How many dwarf planets are there in the outer solar system?". 2015-07-21. Archived from the original on 2011-10-18. Retrieved 2015-07-22.
  7. ^ Emel’yanenko, V. V; Kiseleva, E. L. (2008). "Resonant motion of trans-Neptunian objects in high-eccentricity orbits". Astronomy Letters. 34: 271–279. Bibcode:2008AstL...34..271E. doi:10.1134/S1063773708040075.

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