메타데이터
| 항목 |
값 |
| Designation |
C/2013 TW5 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-17T15:50:25.054080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:41Z |
| Obs used |
421 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2014-06-23.0000000 |
| e |
0.98693812 |
| q (au) |
5.830627 |
| a (au) |
446.385044 |
| i (deg) |
31.401407 |
| Ω (om, deg) |
319.703831 |
| ω (w, deg) |
190.375424 |
| M (ma, deg) |
359.994183 |
밝기
산란 + 전체 선형
$$
M_a = (11.679 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.679 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.728 |
| k |
0.800 |
| δ90 |
9.998 |
| 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) |
| 2026-07-29 00:00 |
18:32:44.67 |
-46:25:33.6 |
HIP 90848 |
10.91 |
| 2026-07-29 12:00 |
18:32:39.35 |
-46:25:18.2 |
HIP 90848 |
10.07 |
| 2026-07-30 00:00 |
18:32:34.06 |
-46:25:02.6 |
HIP 90848 |
9.26 |
| 2026-07-30 12:00 |
18:32:28.81 |
-46:24:46.7 |
HIP 90848 |
8.47 |
| 2026-07-31 00:00 |
18:32:23.58 |
-46:24:30.6 |
HIP 90848 |
7.72 |
| 2026-07-31 12:00 |
18:32:18.39 |
-46:24:14.3 |
HIP 90848 |
7.01 |
| 2026-08-01 00:00 |
18:32:13.24 |
-46:23:57.7 |
HIP 90848 |
6.37 |
| 2026-08-01 12:00 |
18:32:08.12 |
-46:23:40.9 |
HIP 90848 |
5.80 |
| 2026-08-02 00:00 |
18:32:03.03 |
-46:23:23.9 |
HIP 90848 |
5.33 |
| 2026-08-02 12:00 |
18:31:57.98 |
-46:23:06.6 |
HIP 90848 |
4.98 |
| 2026-08-03 00:00 |
18:31:52.97 |
-46:22:49.1 |
HIP 90848 |
4.78 |
| 2026-08-03 12:00 |
18:31:47.99 |
-46:22:31.4 |
HIP 90848 |
4.74 |
| 2026-08-04 00:00 |
18:31:43.05 |
-46:22:13.4 |
HIP 90848 |
4.87 |
| 2026-08-04 12:00 |
18:31:38.14 |
-46:21:55.3 |
HIP 90848 |
5.15 |
| 2026-08-05 00:00 |
18:31:33.27 |
-46:21:36.9 |
HIP 90848 |
5.56 |
| 2026-08-05 12:00 |
18:31:28.44 |
-46:21:18.3 |
HIP 90848 |
6.06 |
| 2026-08-06 00:00 |
18:31:23.65 |
-46:20:59.4 |
HIP 90848 |
6.64 |
| 2026-08-06 12:00 |
18:31:18.90 |
-46:20:40.4 |
HIP 90848 |
7.27 |
| 2026-08-07 00:00 |
18:31:14.19 |
-46:20:21.1 |
HIP 90848 |
7.94 |
| 2026-08-07 12:00 |
18:31:09.51 |
-46:20:01.6 |
HIP 90848 |
8.65 |
| 2026-08-08 00:00 |
18:31:04.88 |
-46:19:41.9 |
HIP 90848 |
9.37 |
| 2026-08-08 12:00 |
18:31:00.28 |
-46:19:22.0 |
HIP 90848 |
10.11 |
| 2026-08-09 00:00 |
18:30:55.73 |
-46:19:01.9 |
HIP 90848 |
10.85 |
| 2026-08-09 12:00 |
18:30:51.22 |
-46:18:41.6 |
HIP 90848 |
11.61 |
| 2026-08-10 00:00 |
18:30:46.75 |
-46:18:21.0 |
HIP 90848 |
12.37 |
| 2026-08-10 12:00 |
18:30:42.33 |
-46:18:00.3 |
HIP 90848 |
13.13 |
| 2026-08-11 00:00 |
18:30:37.94 |
-46:17:39.3 |
HIP 90848 |
13.90 |
| 2026-08-11 12:00 |
18:30:33.60 |
-46:17:18.2 |
HIP 90848 |
14.67 |
| 2026-08-12 00:00 |
18:30:29.30 |
-46:16:56.8 |
HIP 90848 |
15.43 |
| 2026-08-12 12:00 |
18:30:25.05 |
-46:16:35.3 |
HIP 90848 |
16.20 |
| 2026-08-13 00:00 |
18:30:20.84 |
-46:16:13.5 |
HIP 90848 |
16.96 |
| 2026-08-13 12:00 |
18:30:16.68 |
-46:15:51.6 |
HIP 90848 |
17.72 |
| 2026-08-14 00:00 |
18:30:12.56 |
-46:15:29.4 |
HIP 90848 |
18.47 |
| 2026-08-14 12:00 |
18:30:08.48 |
-46:15:07.1 |
HIP 90848 |
19.23 |
| 2026-08-15 00:00 |
18:30:04.46 |
-46:14:44.6 |
HIP 90848 |
19.97 |
| 2026-08-15 12:00 |
18:30:00.47 |
-46:14:21.8 |
HIP 90848 |
20.72 |
| 2026-08-16 00:00 |
18:29:56.54 |
-46:13:58.9 |
HIP 90848 |
21.46 |
| 2026-08-16 12:00 |
18:29:52.65 |
-46:13:35.9 |
HIP 90848 |
22.20 |
| 2026-08-17 00:00 |
18:29:48.81 |
-46:13:12.6 |
HIP 90848 |
22.93 |
| 2026-08-17 12:00 |
18:29:45.02 |
-46:12:49.1 |
HIP 90848 |
23.65 |
| 2026-08-18 00:00 |
18:29:41.27 |
-46:12:25.5 |
HIP 90848 |
24.38 |
| 2026-08-18 12:00 |
18:29:37.58 |
-46:12:01.7 |
HIP 90848 |
25.09 |
| 2026-08-19 00:00 |
18:29:33.93 |
-46:11:37.8 |
HIP 90848 |
25.81 |