메타데이터
| 항목 |
값 |
| Designation |
31P/Schwassmann-Wachmann 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-09-29T11:17:27.623040Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T15:25:14Z |
| Obs used |
1033 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
23.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-03-07.0000000 |
| e |
0.19305440 |
| q (au) |
3.424301 |
| a (au) |
4.243534 |
| i (deg) |
4.546330 |
| Ω (om, deg) |
114.186081 |
| ω (w, deg) |
17.932946 |
| M (ma, deg) |
17.874040 |
밝기
산란 + 전체 선형
$$
M_a = (7.703 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.703 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-09-20 00:00 |
04:03:43.70 |
+15:53:50.7 |
HIP 19148 |
38.55 |
| 2026-09-20 12:00 |
04:03:46.85 |
+15:53:34.1 |
HIP 19148 |
37.75 |
| 2026-09-21 00:00 |
04:03:49.74 |
+15:53:16.9 |
HIP 19148 |
36.99 |
| 2026-09-21 12:00 |
04:03:52.39 |
+15:52:59.0 |
HIP 19148 |
36.30 |
| 2026-09-22 00:00 |
04:03:54.77 |
+15:52:40.4 |
HIP 19148 |
35.66 |
| 2026-09-22 12:00 |
04:03:56.91 |
+15:52:21.1 |
HIP 19148 |
35.07 |
| 2026-09-23 00:00 |
04:03:58.78 |
+15:52:01.2 |
HIP 19148 |
34.54 |
| 2026-09-23 12:00 |
04:04:00.40 |
+15:51:40.6 |
HIP 19148 |
34.07 |
| 2026-09-24 00:00 |
04:04:01.76 |
+15:51:19.3 |
HIP 19148 |
33.66 |
| 2026-09-24 12:00 |
04:04:02.87 |
+15:50:57.4 |
HIP 19148 |
33.30 |
| 2026-09-25 00:00 |
04:04:03.71 |
+15:50:34.8 |
HIP 19148 |
33.00 |
| 2026-09-25 12:00 |
04:04:04.30 |
+15:50:11.6 |
HIP 19148 |
32.77 |
| 2026-09-26 00:00 |
04:04:04.63 |
+15:49:47.7 |
HIP 19148 |
32.59 |
| 2026-09-26 12:00 |
04:04:04.70 |
+15:49:23.1 |
HIP 19148 |
32.48 |
| 2026-09-27 00:00 |
04:04:04.51 |
+15:48:57.9 |
HIP 19148 |
32.43 |
| 2026-09-27 12:00 |
04:04:04.06 |
+15:48:32.1 |
HIP 19148 |
32.45 |
| 2026-09-28 00:00 |
04:04:03.34 |
+15:48:05.6 |
HIP 19120 |
32.50 |
| 2026-09-28 12:00 |
04:04:02.37 |
+15:47:38.5 |
HIP 19120 |
32.44 |
| 2026-09-29 00:00 |
04:04:01.13 |
+15:47:10.7 |
HIP 19120 |
32.45 |
| 2026-09-29 12:00 |
04:03:59.63 |
+15:46:42.3 |
HIP 19120 |
32.51 |
| 2026-09-30 00:00 |
04:03:57.87 |
+15:46:13.2 |
HIP 19120 |
32.63 |
| 2026-09-30 12:00 |
04:03:55.84 |
+15:45:43.6 |
HIP 19120 |
32.81 |
| 2026-10-01 00:00 |
04:03:53.56 |
+15:45:13.3 |
HIP 19120 |
33.06 |
| 2026-10-01 12:00 |
04:03:51.00 |
+15:44:42.3 |
HIP 19120 |
33.38 |
| 2026-10-02 00:00 |
04:03:48.19 |
+15:44:10.7 |
HIP 19120 |
33.76 |
| 2026-10-02 12:00 |
04:03:45.10 |
+15:43:38.6 |
HIP 19120 |
34.22 |
| 2026-10-03 00:00 |
04:03:41.76 |
+15:43:05.8 |
HIP 19120 |
34.75 |
| 2026-10-03 12:00 |
04:03:38.15 |
+15:42:32.3 |
HIP 19120 |
35.35 |
| 2026-10-04 00:00 |
04:03:34.27 |
+15:41:58.3 |
HIP 19120 |
36.03 |
| 2026-10-04 12:00 |
04:03:30.13 |
+15:41:23.7 |
HIP 18843 |
36.74 |
| 2026-10-05 00:00 |
04:03:25.72 |
+15:40:48.4 |
HIP 18843 |
35.77 |
| 2026-10-05 12:00 |
04:03:21.05 |
+15:40:12.6 |
HIP 18843 |
34.78 |
| 2026-10-06 00:00 |
04:03:16.11 |
+15:39:36.1 |
HIP 18843 |
33.78 |
| 2026-10-06 12:00 |
04:03:10.91 |
+15:38:59.1 |
HIP 18843 |
32.77 |
| 2026-10-07 00:00 |
04:03:05.45 |
+15:38:21.5 |
HIP 18843 |
31.76 |
| 2026-10-07 12:00 |
04:02:59.72 |
+15:37:43.3 |
HIP 18843 |
30.76 |
| 2026-10-08 00:00 |
04:02:53.73 |
+15:37:04.6 |
HIP 18843 |
29.79 |
| 2026-10-08 12:00 |
04:02:47.48 |
+15:36:25.2 |
HIP 18843 |
28.84 |
| 2026-10-09 00:00 |
04:02:40.96 |
+15:35:45.3 |
HIP 18843 |
27.95 |
| 2026-10-09 12:00 |
04:02:34.18 |
+15:35:04.9 |
HIP 18843 |
27.12 |
| 2026-10-10 00:00 |
04:02:27.14 |
+15:34:23.9 |
HIP 18730 |
25.40 |
| 2026-10-10 12:00 |
04:02:19.84 |
+15:33:42.3 |
HIP 18730 |
23.53 |
| 2026-10-11 00:00 |
04:02:12.29 |
+15:33:00.3 |
HIP 18730 |
21.60 |