메타데이터
| 항목 |
값 |
| Designation |
C/2015 C2 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-04T13:33:59.673600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:06Z |
| Obs used |
151 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-04-26.0000000 |
| e |
0.99851030 |
| q (au) |
0.711377 |
| a (au) |
477.531702 |
| i (deg) |
94.501074 |
| Ω (om, deg) |
49.529700 |
| ω (w, deg) |
334.134062 |
| M (ma, deg) |
0.004952 |
밝기
산란 + 전체 선형
$$
M_a = (14.217 + 3.643\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.217 |
| n |
3.643 |
| 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) |
| 2026-09-20 00:00 |
16:00:55.98 |
+23:29:56.5 |
HIP 78338 |
17.24 |
| 2026-09-20 12:00 |
16:00:57.87 |
+23:29:10.9 |
HIP 78338 |
17.91 |
| 2026-09-21 00:00 |
16:00:59.80 |
+23:28:25.4 |
HIP 78338 |
18.60 |
| 2026-09-21 12:00 |
16:01:01.76 |
+23:27:40.0 |
HIP 78338 |
19.31 |
| 2026-09-22 00:00 |
16:01:03.76 |
+23:26:54.8 |
HIP 78338 |
20.04 |
| 2026-09-22 12:00 |
16:01:05.78 |
+23:26:09.7 |
HIP 78338 |
20.79 |
| 2026-09-23 00:00 |
16:01:07.84 |
+23:25:24.7 |
HIP 78338 |
21.55 |
| 2026-09-23 12:00 |
16:01:09.93 |
+23:24:39.8 |
HIP 78338 |
22.33 |
| 2026-09-24 00:00 |
16:01:12.05 |
+23:23:55.0 |
HIP 78338 |
23.12 |
| 2026-09-24 12:00 |
16:01:14.21 |
+23:23:10.4 |
HIP 78338 |
23.92 |
| 2026-09-25 00:00 |
16:01:16.40 |
+23:22:25.9 |
HIP 78338 |
24.74 |
| 2026-09-25 12:00 |
16:01:18.61 |
+23:21:41.6 |
HIP 78338 |
25.56 |
| 2026-09-26 00:00 |
16:01:20.86 |
+23:20:57.3 |
HIP 78338 |
26.40 |
| 2026-09-26 12:00 |
16:01:23.14 |
+23:20:13.3 |
HIP 78338 |
27.24 |
| 2026-09-27 00:00 |
16:01:25.46 |
+23:19:29.3 |
HIP 78375 |
27.68 |
| 2026-09-27 12:00 |
16:01:27.80 |
+23:18:45.6 |
HIP 78375 |
27.55 |
| 2026-09-28 00:00 |
16:01:30.17 |
+23:18:01.9 |
HIP 78375 |
27.46 |
| 2026-09-28 12:00 |
16:01:32.58 |
+23:17:18.4 |
HIP 78375 |
27.41 |
| 2026-09-29 00:00 |
16:01:35.01 |
+23:16:35.1 |
HIP 78449 |
27.05 |
| 2026-09-29 12:00 |
16:01:37.48 |
+23:15:51.9 |
HIP 78449 |
26.57 |
| 2026-09-30 00:00 |
16:01:39.97 |
+23:15:08.9 |
HIP 78449 |
26.11 |
| 2026-09-30 12:00 |
16:01:42.50 |
+23:14:26.0 |
HIP 78449 |
25.69 |
| 2026-10-01 00:00 |
16:01:45.05 |
+23:13:43.3 |
HIP 78449 |
25.30 |
| 2026-10-01 12:00 |
16:01:47.64 |
+23:13:00.8 |
HIP 78449 |
24.94 |
| 2026-10-02 00:00 |
16:01:50.25 |
+23:12:18.4 |
HIP 78449 |
24.62 |
| 2026-10-02 12:00 |
16:01:52.90 |
+23:11:36.2 |
HIP 78554 |
24.03 |
| 2026-10-03 00:00 |
16:01:55.57 |
+23:10:54.2 |
HIP 78554 |
23.21 |
| 2026-10-03 12:00 |
16:01:58.27 |
+23:10:12.4 |
HIP 78554 |
22.39 |
| 2026-10-04 00:00 |
16:02:01.00 |
+23:09:30.7 |
HIP 78554 |
21.59 |
| 2026-10-04 12:00 |
16:02:03.76 |
+23:08:49.2 |
HIP 78554 |
20.81 |
| 2026-10-05 00:00 |
16:02:06.55 |
+23:08:07.9 |
HIP 78554 |
20.03 |
| 2026-10-05 12:00 |
16:02:09.36 |
+23:07:26.8 |
HIP 78554 |
19.28 |
| 2026-10-06 00:00 |
16:02:12.21 |
+23:06:45.9 |
HIP 78554 |
18.54 |
| 2026-10-06 12:00 |
16:02:15.08 |
+23:06:05.2 |
HIP 78554 |
17.83 |
| 2026-10-07 00:00 |
16:02:17.98 |
+23:05:24.6 |
HIP 78554 |
17.15 |
| 2026-10-07 12:00 |
16:02:20.91 |
+23:04:44.3 |
HIP 78554 |
16.49 |
| 2026-10-08 00:00 |
16:02:23.86 |
+23:04:04.2 |
HIP 78554 |
15.87 |
| 2026-10-08 12:00 |
16:02:26.84 |
+23:03:24.2 |
HIP 78554 |
15.29 |
| 2026-10-09 00:00 |
16:02:29.85 |
+23:02:44.5 |
HIP 78554 |
14.75 |
| 2026-10-09 12:00 |
16:02:32.88 |
+23:02:05.0 |
HIP 78583 |
13.99 |
| 2026-10-10 00:00 |
16:02:35.94 |
+23:01:25.7 |
HIP 78583 |
13.23 |
| 2026-10-10 12:00 |
16:02:39.03 |
+23:00:46.6 |
HIP 78583 |
12.49 |
| 2026-10-11 00:00 |
16:02:42.14 |
+23:00:07.7 |
HIP 78583 |
11.79 |