Spitzer Alpha Candidates
In 2007, observations using the Spitzer Space Telescope were used to calculate the sizes of several large TNOs. The following were found to be greater than 600 km in diameter. (2007 OR10 is not included because it was not observed by Spitzer.) Although (84522) 2002 TC302 has a dim absolute magnitude, it is placed high on the list; it is believed to have a low albedo.
| Name | (H) | Spitzer Size (km) |
Spitzer Albedo |
V–R |
|---|---|---|---|---|
| Eris | −1.1 | 2,600+400 −200 |
0.70+0.15 −0.20 |
|
| Sedna | 1.6 | <1,600 | >0.16 | 0.78 |
| Makemake | 0.0 | 1,500+400 −200 |
0.80+0.10 −0.20 |
|
| Haumea | 0.5 | 1,150+250 −100 |
0.84+0.10 −0.20 |
|
| (84522) 2002 TC302 | 3.8 | 1,145±331 | 0.03+0.03 −0.01 |
0.67 |
| Orcus | 2.3 | 946±73 | 0.20±0.03 | 0.37 |
| Quaoar | 2.5 | 844±198 | 0.20+0.13 −0.07 |
0.64 |
| (55565) 2002 AW197 | 3.2 | 735±112 | 0.12+0.04 −0.03 |
0.56 |
| (84922) 2003 VS2 | 4.0 | 725±193 | 0.06+0.05 −0.02 |
0.59 |
| (307261) 2002 MS4 | 3.8 | 726±123 | 0.08+0.04 −0.02 |
0.38 |
| (208996) 2003 AZ84 | 4.0 | 686±97 | 0.12+.04 −.03 |
0.36 |
| (55637) 2002 UX25 | 3.6 | 681±115 | 0.12+0.05 −0.03 |
0.57 |
| (90568) 2004 GV9 | 3.9 | 677±70 | 0.08+0.02 −0.01 |
0.52 |
| Ixion | 3.2 | 573±141 | 0.16+0.12 −0.06 |
0.61 |
Read more about this topic: List Of Dwarf Planet Candidates
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