메타데이터
| 항목 |
값 |
| Designation |
C/1968 Y1 (Thomas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1969-01-12T06:16:18.609600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
10.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1969-02-14.0000000 |
| e |
0.99530224 |
| q (au) |
3.316098 |
| a (au) |
705.888695 |
| i (deg) |
45.229346 |
| Ω (om, deg) |
16.110035 |
| ω (w, deg) |
82.582846 |
| M (ma, deg) |
0.001721 |
밝기
산란 + 전체 선형
$$
M_a = (6.454 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.454 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
15:33:06.03 |
-58:45:19.1 |
HIP 76341 |
20.46 |
| 2026-05-12 12:00 |
15:33:03.31 |
-58:45:16.7 |
HIP 76341 |
20.80 |
| 2026-05-13 00:00 |
15:33:00.60 |
-58:45:14.3 |
HIP 76341 |
21.15 |
| 2026-05-13 12:00 |
15:32:57.88 |
-58:45:11.7 |
HIP 76341 |
21.50 |
| 2026-05-14 00:00 |
15:32:55.16 |
-58:45:09.0 |
HIP 76341 |
21.85 |
| 2026-05-14 12:00 |
15:32:52.44 |
-58:45:06.2 |
HIP 76341 |
22.19 |
| 2026-05-15 00:00 |
15:32:49.72 |
-58:45:03.3 |
HIP 76341 |
22.55 |
| 2026-05-15 12:00 |
15:32:47.00 |
-58:45:00.2 |
HIP 76341 |
22.90 |
| 2026-05-16 00:00 |
15:32:44.27 |
-58:44:57.0 |
HIP 76341 |
23.25 |
| 2026-05-16 12:00 |
15:32:41.55 |
-58:44:53.7 |
HIP 76341 |
23.60 |
| 2026-05-17 00:00 |
15:32:38.83 |
-58:44:50.2 |
HIP 76341 |
23.96 |
| 2026-05-17 12:00 |
15:32:36.11 |
-58:44:46.6 |
HIP 76341 |
24.31 |
| 2026-05-18 00:00 |
15:32:33.38 |
-58:44:42.9 |
HIP 75863 |
24.05 |
| 2026-05-18 12:00 |
15:32:30.66 |
-58:44:39.1 |
HIP 75863 |
23.70 |
| 2026-05-19 00:00 |
15:32:27.94 |
-58:44:35.2 |
HIP 75863 |
23.35 |
| 2026-05-19 12:00 |
15:32:25.22 |
-58:44:31.1 |
HIP 75863 |
23.00 |
| 2026-05-20 00:00 |
15:32:22.51 |
-58:44:26.9 |
HIP 75863 |
22.65 |
| 2026-05-20 12:00 |
15:32:19.79 |
-58:44:22.6 |
HIP 75863 |
22.30 |
| 2026-05-21 00:00 |
15:32:17.08 |
-58:44:18.1 |
HIP 75863 |
21.95 |
| 2026-05-21 12:00 |
15:32:14.36 |
-58:44:13.6 |
HIP 75863 |
21.60 |
| 2026-05-22 00:00 |
15:32:11.65 |
-58:44:08.9 |
HIP 75863 |
21.25 |
| 2026-05-22 12:00 |
15:32:08.95 |
-58:44:04.1 |
HIP 75863 |
20.90 |
| 2026-05-23 00:00 |
15:32:06.24 |
-58:43:59.2 |
HIP 75863 |
20.55 |
| 2026-05-23 12:00 |
15:32:03.54 |
-58:43:54.1 |
HIP 75863 |
20.20 |
| 2026-05-24 00:00 |
15:32:00.84 |
-58:43:48.9 |
HIP 75863 |
19.84 |
| 2026-05-24 12:00 |
15:31:58.15 |
-58:43:43.7 |
HIP 75863 |
19.49 |
| 2026-05-25 00:00 |
15:31:55.46 |
-58:43:38.3 |
HIP 75863 |
19.14 |
| 2026-05-25 12:00 |
15:31:52.77 |
-58:43:32.7 |
HIP 75863 |
18.79 |
| 2026-05-26 00:00 |
15:31:50.08 |
-58:43:27.1 |
HIP 75863 |
18.44 |
| 2026-05-26 12:00 |
15:31:47.40 |
-58:43:21.3 |
HIP 75863 |
18.08 |
| 2026-05-27 00:00 |
15:31:44.73 |
-58:43:15.5 |
HIP 75863 |
17.73 |
| 2026-05-27 12:00 |
15:31:42.06 |
-58:43:09.5 |
HIP 75863 |
17.38 |
| 2026-05-28 00:00 |
15:31:39.39 |
-58:43:03.4 |
HIP 75863 |
17.02 |
| 2026-05-28 12:00 |
15:31:36.73 |
-58:42:57.2 |
HIP 75863 |
16.67 |
| 2026-05-29 00:00 |
15:31:34.08 |
-58:42:50.8 |
HIP 75863 |
16.32 |
| 2026-05-29 12:00 |
15:31:31.42 |
-58:42:44.4 |
HIP 75863 |
15.97 |
| 2026-05-30 00:00 |
15:31:28.78 |
-58:42:37.9 |
HIP 75863 |
15.61 |
| 2026-05-30 12:00 |
15:31:26.14 |
-58:42:31.2 |
HIP 75863 |
15.26 |
| 2026-05-31 00:00 |
15:31:23.51 |
-58:42:24.4 |
HIP 75863 |
14.91 |
| 2026-05-31 12:00 |
15:31:20.88 |
-58:42:17.5 |
HIP 75863 |
14.56 |
| 2026-06-01 00:00 |
15:31:18.26 |
-58:42:10.5 |
HIP 75863 |
14.20 |
| 2026-06-01 12:00 |
15:31:15.64 |
-58:42:03.4 |
HIP 75863 |
13.85 |
| 2026-06-02 00:00 |
15:31:13.03 |
-58:41:56.2 |
HIP 75863 |
13.50 |