메타데이터
| 항목 |
값 |
| Designation |
31P/Schwassmann-Wachmann 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-09-29T11:16:57.953280Z |
| Orbit solution date (soln_date, UTC) |
2025-11-23T22:21:40Z |
| Obs used |
1028 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
23.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-02-16.0000000 |
| e |
0.19303098 |
| q (au) |
3.424308 |
| a (au) |
4.243419 |
| i (deg) |
4.546365 |
| Ω (om, deg) |
114.186460 |
| ω (w, deg) |
17.932787 |
| M (ma, deg) |
15.732489 |
밝기
산란 + 전체 선형
$$
M_a = (14.954 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.954 |
| n |
2.000 |
| gf |
0.961 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.178 |
| 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 |
03:37:55.94 |
+15:14:12.4 |
HIP 16985 |
9.01 |
| 2026-07-29 12:00 |
03:38:19.39 |
+15:15:14.1 |
HIP 16985 |
6.47 |
| 2026-07-30 00:00 |
03:38:42.72 |
+15:16:15.1 |
HIP 16985 |
8.27 |
| 2026-07-30 12:00 |
03:39:05.93 |
+15:17:15.3 |
HIP 16985 |
12.63 |
| 2026-07-31 00:00 |
03:39:29.01 |
+15:18:14.8 |
HIP 16985 |
17.72 |
| 2026-07-31 12:00 |
03:39:51.96 |
+15:19:13.6 |
HIP 16985 |
23.04 |
| 2026-08-01 00:00 |
03:40:14.78 |
+15:20:11.6 |
HIP 16985 |
28.45 |
| 2026-08-01 12:00 |
03:40:37.48 |
+15:21:08.8 |
HIP 17232 |
30.17 |
| 2026-08-02 00:00 |
03:41:00.04 |
+15:22:05.3 |
HIP 17232 |
29.43 |
| 2026-08-02 12:00 |
03:41:22.48 |
+15:23:01.1 |
HIP 17281 |
29.26 |
| 2026-08-03 00:00 |
03:41:44.78 |
+15:23:56.1 |
HIP 17318 |
26.86 |
| 2026-08-03 12:00 |
03:42:06.94 |
+15:24:50.4 |
HIP 17318 |
24.50 |
| 2026-08-04 00:00 |
03:42:28.97 |
+15:25:43.9 |
HIP 17318 |
23.20 |
| 2026-08-04 12:00 |
03:42:50.87 |
+15:26:36.7 |
HIP 17318 |
23.12 |
| 2026-08-05 00:00 |
03:43:12.62 |
+15:27:28.7 |
HIP 17318 |
24.23 |
| 2026-08-05 12:00 |
03:43:34.24 |
+15:28:19.9 |
HIP 17318 |
26.38 |
| 2026-08-06 00:00 |
03:43:55.71 |
+15:29:10.5 |
HIP 17318 |
29.31 |
| 2026-08-06 12:00 |
03:44:17.04 |
+15:30:00.2 |
HIP 17413 |
31.89 |
| 2026-08-07 00:00 |
03:44:38.23 |
+15:30:49.2 |
HIP 17413 |
32.45 |
| 2026-08-07 12:00 |
03:44:59.27 |
+15:31:37.4 |
HIP 17413 |
33.79 |
| 2026-08-08 00:00 |
03:45:20.17 |
+15:32:24.9 |
HIP 17413 |
35.81 |
| 2026-08-08 12:00 |
03:45:40.92 |
+15:33:11.7 |
HIP 17413 |
38.39 |
| 2026-08-09 00:00 |
03:46:01.52 |
+15:33:57.6 |
HIP 17804 |
38.08 |
| 2026-08-09 12:00 |
03:46:21.97 |
+15:34:42.8 |
HIP 17804 |
33.27 |
| 2026-08-10 00:00 |
03:46:42.26 |
+15:35:27.3 |
HIP 17804 |
28.56 |
| 2026-08-10 12:00 |
03:47:02.40 |
+15:36:11.0 |
HIP 17804 |
23.97 |
| 2026-08-11 00:00 |
03:47:22.39 |
+15:36:53.9 |
HIP 17804 |
19.56 |
| 2026-08-11 12:00 |
03:47:42.22 |
+15:37:36.0 |
HIP 17804 |
15.47 |
| 2026-08-12 00:00 |
03:48:01.89 |
+15:38:17.4 |
HIP 17804 |
11.96 |
| 2026-08-12 12:00 |
03:48:21.40 |
+15:38:58.1 |
HIP 17804 |
9.62 |
| 2026-08-13 00:00 |
03:48:40.75 |
+15:39:38.0 |
HIP 17804 |
9.32 |
| 2026-08-13 12:00 |
03:48:59.94 |
+15:40:17.1 |
HIP 17804 |
11.18 |
| 2026-08-14 00:00 |
03:49:18.96 |
+15:40:55.4 |
HIP 17804 |
14.33 |
| 2026-08-14 12:00 |
03:49:37.82 |
+15:41:33.1 |
HIP 17804 |
18.09 |
| 2026-08-15 00:00 |
03:49:56.51 |
+15:42:09.9 |
HIP 17944 |
18.30 |
| 2026-08-15 12:00 |
03:50:15.04 |
+15:42:46.0 |
HIP 17944 |
17.26 |
| 2026-08-16 00:00 |
03:50:33.40 |
+15:43:21.3 |
HIP 17944 |
17.36 |
| 2026-08-16 12:00 |
03:50:51.59 |
+15:43:55.9 |
HIP 17944 |
18.55 |
| 2026-08-17 00:00 |
03:51:09.60 |
+15:44:29.7 |
HIP 17944 |
20.62 |
| 2026-08-17 12:00 |
03:51:27.44 |
+15:45:02.8 |
HIP 17944 |
23.30 |
| 2026-08-18 00:00 |
03:51:45.12 |
+15:45:35.1 |
HIP 18176 |
23.81 |
| 2026-08-18 12:00 |
03:52:02.61 |
+15:46:06.6 |
HIP 18176 |
20.40 |
| 2026-08-19 00:00 |
03:52:19.93 |
+15:46:37.4 |
HIP 18176 |
17.37 |