메타데이터
| 항목 |
값 |
| Designation |
C/2012 E2 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-03-15T00:41:51.241920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:04Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-03-13.0000000 |
| e |
1.00049131 |
| q (au) |
0.006962 |
| a (au) |
-14.169573 |
| i (deg) |
144.430741 |
| Ω (om, deg) |
6.576461 |
| ω (w, deg) |
82.412294 |
| M (ma, deg) |
-0.037494 |
밝기
산란 + 전체 선형
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
06:57:39.06 |
-11:54:25.4 |
HIP 33489 |
25.69 |
| 2026-05-12 12:00 |
06:57:40.85 |
-11:54:07.9 |
HIP 33489 |
25.98 |
| 2026-05-13 00:00 |
06:57:42.67 |
-11:53:50.6 |
HIP 33489 |
26.28 |
| 2026-05-13 12:00 |
06:57:44.51 |
-11:53:33.4 |
HIP 33489 |
26.58 |
| 2026-05-14 00:00 |
06:57:46.36 |
-11:53:16.4 |
HIP 33489 |
26.89 |
| 2026-05-14 12:00 |
06:57:48.24 |
-11:52:59.6 |
HIP 33489 |
27.20 |
| 2026-05-15 00:00 |
06:57:50.13 |
-11:52:42.9 |
HIP 33489 |
27.52 |
| 2026-05-15 12:00 |
06:57:52.04 |
-11:52:26.4 |
HIP 33489 |
27.84 |
| 2026-05-16 00:00 |
06:57:53.97 |
-11:52:10.0 |
HIP 33567 |
27.59 |
| 2026-05-16 12:00 |
06:57:55.91 |
-11:51:53.9 |
HIP 33567 |
27.20 |
| 2026-05-17 00:00 |
06:57:57.88 |
-11:51:37.9 |
HIP 33567 |
26.81 |
| 2026-05-17 12:00 |
06:57:59.86 |
-11:51:22.1 |
HIP 33567 |
26.42 |
| 2026-05-18 00:00 |
06:58:01.86 |
-11:51:06.4 |
HIP 33567 |
26.04 |
| 2026-05-18 12:00 |
06:58:03.88 |
-11:50:50.9 |
HIP 33567 |
25.68 |
| 2026-05-19 00:00 |
06:58:05.91 |
-11:50:35.6 |
HIP 33567 |
25.32 |
| 2026-05-19 12:00 |
06:58:07.96 |
-11:50:20.5 |
HIP 33567 |
24.97 |
| 2026-05-20 00:00 |
06:58:10.03 |
-11:50:05.5 |
HIP 33567 |
24.63 |
| 2026-05-20 12:00 |
06:58:12.11 |
-11:49:50.7 |
HIP 33567 |
24.30 |
| 2026-05-21 00:00 |
06:58:14.22 |
-11:49:36.1 |
HIP 33567 |
23.98 |
| 2026-05-21 12:00 |
06:58:16.33 |
-11:49:21.7 |
HIP 33567 |
23.68 |
| 2026-05-22 00:00 |
06:58:18.47 |
-11:49:07.5 |
HIP 33567 |
23.38 |
| 2026-05-22 12:00 |
06:58:20.62 |
-11:48:53.4 |
HIP 33567 |
23.10 |
| 2026-05-23 00:00 |
06:58:22.78 |
-11:48:39.5 |
HIP 33567 |
22.84 |
| 2026-05-23 12:00 |
06:58:24.96 |
-11:48:25.8 |
HIP 33567 |
22.59 |
| 2026-05-24 00:00 |
06:58:27.16 |
-11:48:12.3 |
HIP 33567 |
22.35 |
| 2026-05-24 12:00 |
06:58:29.37 |
-11:47:59.0 |
HIP 33567 |
22.13 |
| 2026-05-25 00:00 |
06:58:31.60 |
-11:47:45.8 |
HIP 33569 |
21.92 |
| 2026-05-25 12:00 |
06:58:33.84 |
-11:47:32.8 |
HIP 33569 |
21.72 |
| 2026-05-26 00:00 |
06:58:36.10 |
-11:47:20.0 |
HIP 33569 |
21.55 |
| 2026-05-26 12:00 |
06:58:38.37 |
-11:47:07.4 |
HIP 33569 |
21.39 |
| 2026-05-27 00:00 |
06:58:40.66 |
-11:46:55.0 |
HIP 33569 |
21.25 |
| 2026-05-27 12:00 |
06:58:42.96 |
-11:46:42.8 |
HIP 33569 |
21.13 |
| 2026-05-28 00:00 |
06:58:45.27 |
-11:46:30.7 |
HIP 33569 |
21.03 |
| 2026-05-28 12:00 |
06:58:47.60 |
-11:46:18.9 |
HIP 33569 |
20.95 |
| 2026-05-29 00:00 |
06:58:49.94 |
-11:46:07.2 |
HIP 33569 |
20.89 |
| 2026-05-29 12:00 |
06:58:52.30 |
-11:45:55.7 |
HIP 33569 |
20.85 |
| 2026-05-30 00:00 |
06:58:54.66 |
-11:45:44.4 |
HIP 33569 |
20.83 |
| 2026-05-30 12:00 |
06:58:57.05 |
-11:45:33.3 |
HIP 33569 |
20.84 |
| 2026-05-31 00:00 |
06:58:59.44 |
-11:45:22.4 |
HIP 33569 |
20.87 |
| 2026-05-31 12:00 |
06:59:01.85 |
-11:45:11.7 |
HIP 33569 |
20.92 |
| 2026-06-01 00:00 |
06:59:04.27 |
-11:45:01.1 |
HIP 33569 |
20.99 |
| 2026-06-01 12:00 |
06:59:06.71 |
-11:44:50.8 |
HIP 33693 |
20.80 |
| 2026-06-02 00:00 |
06:59:09.15 |
-11:44:40.6 |
HIP 33693 |
20.54 |