메타데이터
| 항목 |
값 |
| Designation |
220P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-12-15T05:47:43.941120Z |
| Orbit solution date (soln_date, UTC) |
2024-01-04T23:43:49Z |
| Obs used |
484 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
10.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-09-25.0000000 |
| e |
0.50218227 |
| q (au) |
1.549755 |
| a (au) |
3.113096 |
| i (deg) |
8.131611 |
| Ω (om, deg) |
150.122641 |
| ω (w, deg) |
180.754819 |
| M (ma, deg) |
116.412147 |
밝기
산란 + 전체 선형
$$
M_a = (13.849 + 5.712\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.849 |
| n |
5.712 |
| gf |
1.000 |
| gb |
-0.926 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:53:10.94 |
-12:38:32.2 |
HIP 103151 |
23.90 |
| 2026-03-26 12:00 |
20:54:33.49 |
-12:33:41.3 |
HIP 103151 |
18.42 |
| 2026-03-27 00:00 |
20:55:56.08 |
-12:28:48.5 |
HIP 103349 |
19.50 |
| 2026-03-27 12:00 |
20:57:18.69 |
-12:23:53.8 |
HIP 103349 |
20.07 |
| 2026-03-28 00:00 |
20:58:41.33 |
-12:18:57.1 |
HIP 103487 |
23.70 |
| 2026-03-28 12:00 |
21:00:04.00 |
-12:13:58.5 |
HIP 103719 |
24.63 |
| 2026-03-29 00:00 |
21:01:26.71 |
-12:08:57.9 |
HIP 103834 |
22.99 |
| 2026-03-29 12:00 |
21:02:49.44 |
-12:03:55.5 |
HIP 103834 |
23.60 |
| 2026-03-30 00:00 |
21:04:12.20 |
-11:58:51.2 |
HIP 104186 |
33.85 |
| 2026-03-30 12:00 |
21:05:34.99 |
-11:53:45.0 |
HIP 104186 |
14.03 |
| 2026-03-31 00:00 |
21:06:57.80 |
-11:48:37.0 |
HIP 104186 |
10.98 |
| 2026-03-31 12:00 |
21:08:20.65 |
-11:43:27.1 |
HIP 104459 |
28.01 |
| 2026-04-01 00:00 |
21:09:43.52 |
-11:38:15.4 |
HIP 104459 |
16.07 |
| 2026-04-01 12:00 |
21:11:06.42 |
-11:33:01.8 |
HIP 104559 |
11.62 |
| 2026-04-02 00:00 |
21:12:29.35 |
-11:27:46.5 |
HIP 104654 |
8.38 |
| 2026-04-02 12:00 |
21:13:52.30 |
-11:22:29.3 |
HIP 104808 |
11.81 |
| 2026-04-03 00:00 |
21:15:15.28 |
-11:17:10.4 |
HIP 104808 |
19.14 |
| 2026-04-03 12:00 |
21:16:38.29 |
-11:11:49.7 |
HIP 105139 |
29.83 |
| 2026-04-04 00:00 |
21:18:01.32 |
-11:06:27.2 |
HIP 105139 |
17.60 |
| 2026-04-04 12:00 |
21:19:24.38 |
-11:01:03.0 |
HIP 105139 |
24.85 |
| 2026-04-05 00:00 |
21:20:47.46 |
-10:55:37.1 |
HIP 105387 |
25.36 |
| 2026-04-05 12:00 |
21:22:10.56 |
-10:50:09.5 |
HIP 105504 |
19.37 |
| 2026-04-06 00:00 |
21:23:33.69 |
-10:44:40.1 |
HIP 105589 |
10.86 |
| 2026-04-06 12:00 |
21:24:56.84 |
-10:39:09.1 |
HIP 105805 |
13.16 |
| 2026-04-07 00:00 |
21:26:20.01 |
-10:33:36.5 |
HIP 105805 |
10.22 |
| 2026-04-07 12:00 |
21:27:43.21 |
-10:28:02.2 |
HIP 106087 |
25.90 |
| 2026-04-08 00:00 |
21:29:06.43 |
-10:22:26.3 |
HIP 106087 |
4.98 |
| 2026-04-08 12:00 |
21:30:29.66 |
-10:16:48.7 |
HIP 106087 |
16.72 |
| 2026-04-09 00:00 |
21:31:52.92 |
-10:11:09.6 |
HIP 106365 |
24.04 |
| 2026-04-09 12:00 |
21:33:16.20 |
-10:05:28.9 |
HIP 106444 |
26.27 |
| 2026-04-10 00:00 |
21:34:39.49 |
-09:59:46.7 |
HIP 106617 |
15.15 |
| 2026-04-10 12:00 |
21:36:02.81 |
-09:54:02.9 |
HIP 106617 |
7.35 |
| 2026-04-11 00:00 |
21:37:26.14 |
-09:48:17.6 |
HIP 106795 |
13.83 |
| 2026-04-11 12:00 |
21:38:49.49 |
-09:42:30.8 |
HIP 106795 |
16.06 |
| 2026-04-12 00:00 |
21:40:12.86 |
-09:36:42.5 |
HIP 107001 |
10.95 |
| 2026-04-12 12:00 |
21:41:36.24 |
-09:30:52.8 |
HIP 107056 |
24.30 |
| 2026-04-13 00:00 |
21:42:59.63 |
-09:25:01.6 |
HIP 107273 |
28.44 |
| 2026-04-13 12:00 |
21:44:23.04 |
-09:19:09.1 |
HIP 107382 |
16.91 |
| 2026-04-14 00:00 |
21:45:46.46 |
-09:13:15.1 |
HIP 107487 |
8.06 |
| 2026-04-14 12:00 |
21:47:09.90 |
-09:07:19.7 |
HIP 107487 |
16.14 |
| 2026-04-15 00:00 |
21:48:33.35 |
-09:01:23.1 |
HIP 107820 |
30.24 |
| 2026-04-15 12:00 |
21:49:56.80 |
-08:55:25.0 |
HIP 107820 |
10.17 |
| 2026-04-16 00:00 |
21:51:20.27 |
-08:49:25.7 |
HIP 107820 |
14.61 |