메타데이터
| 항목 |
값 |
| Designation |
C/2009 F2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-11-14T02:40:43.518720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:29Z |
| Obs used |
363 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-07-09.0000000 |
| e |
0.98302695 |
| q (au) |
5.875026 |
| a (au) |
346.138419 |
| i (deg) |
59.366975 |
| Ω (om, deg) |
214.055338 |
| ω (w, deg) |
336.344497 |
| M (ma, deg) |
0.036255 |
밝기
산란 + 전체 선형
$$
M_a = (9.300 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.300 |
| n |
2.109 |
| gf |
1.000 |
| gb |
-0.969 |
| 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) |
| 2026-05-12 00:00 |
20:56:32.99 |
+41:43:37.6 |
HIP 103404 |
6.59 |
| 2026-05-12 12:00 |
20:56:32.78 |
+41:44:24.0 |
HIP 103404 |
7.19 |
| 2026-05-13 00:00 |
20:56:32.53 |
+41:45:10.3 |
HIP 103404 |
7.83 |
| 2026-05-13 12:00 |
20:56:32.23 |
+41:45:56.5 |
HIP 103404 |
8.50 |
| 2026-05-14 00:00 |
20:56:31.90 |
+41:46:42.5 |
HIP 103404 |
9.18 |
| 2026-05-14 12:00 |
20:56:31.52 |
+41:47:28.4 |
HIP 103404 |
9.88 |
| 2026-05-15 00:00 |
20:56:31.11 |
+41:48:14.2 |
HIP 103404 |
10.59 |
| 2026-05-15 12:00 |
20:56:30.65 |
+41:48:59.8 |
HIP 103404 |
11.30 |
| 2026-05-16 00:00 |
20:56:30.15 |
+41:49:45.2 |
HIP 103404 |
12.03 |
| 2026-05-16 12:00 |
20:56:29.62 |
+41:50:30.5 |
HIP 103404 |
12.76 |
| 2026-05-17 00:00 |
20:56:29.04 |
+41:51:15.7 |
HIP 103404 |
13.49 |
| 2026-05-17 12:00 |
20:56:28.42 |
+41:52:00.7 |
HIP 103404 |
14.23 |
| 2026-05-18 00:00 |
20:56:27.76 |
+41:52:45.5 |
HIP 103404 |
14.97 |
| 2026-05-18 12:00 |
20:56:27.06 |
+41:53:30.2 |
HIP 103404 |
15.71 |
| 2026-05-19 00:00 |
20:56:26.32 |
+41:54:14.7 |
HIP 103404 |
16.45 |
| 2026-05-19 12:00 |
20:56:25.54 |
+41:54:59.0 |
HIP 103404 |
17.19 |
| 2026-05-20 00:00 |
20:56:24.72 |
+41:55:43.2 |
HIP 103404 |
17.94 |
| 2026-05-20 12:00 |
20:56:23.86 |
+41:56:27.1 |
HIP 103404 |
18.68 |
| 2026-05-21 00:00 |
20:56:22.97 |
+41:57:10.9 |
HIP 103404 |
19.42 |
| 2026-05-21 12:00 |
20:56:22.03 |
+41:57:54.5 |
HIP 103404 |
20.17 |
| 2026-05-22 00:00 |
20:56:21.05 |
+41:58:37.9 |
HIP 103404 |
20.91 |
| 2026-05-22 12:00 |
20:56:20.03 |
+41:59:21.2 |
HIP 103404 |
21.65 |
| 2026-05-23 00:00 |
20:56:18.98 |
+42:00:04.2 |
HIP 103269 |
21.38 |
| 2026-05-23 12:00 |
20:56:17.88 |
+42:00:47.0 |
HIP 103269 |
20.67 |
| 2026-05-24 00:00 |
20:56:16.75 |
+42:01:29.6 |
HIP 103269 |
19.96 |
| 2026-05-24 12:00 |
20:56:15.57 |
+42:02:12.1 |
HIP 103269 |
19.25 |
| 2026-05-25 00:00 |
20:56:14.36 |
+42:02:54.3 |
HIP 103269 |
18.55 |
| 2026-05-25 12:00 |
20:56:13.11 |
+42:03:36.3 |
HIP 103269 |
17.84 |
| 2026-05-26 00:00 |
20:56:11.82 |
+42:04:18.1 |
HIP 103269 |
17.14 |
| 2026-05-26 12:00 |
20:56:10.49 |
+42:04:59.7 |
HIP 103269 |
16.44 |
| 2026-05-27 00:00 |
20:56:09.12 |
+42:05:41.0 |
HIP 103269 |
15.74 |
| 2026-05-27 12:00 |
20:56:07.72 |
+42:06:22.2 |
HIP 103269 |
15.04 |
| 2026-05-28 00:00 |
20:56:06.28 |
+42:07:03.1 |
HIP 103269 |
14.34 |
| 2026-05-28 12:00 |
20:56:04.80 |
+42:07:43.8 |
HIP 103269 |
13.64 |
| 2026-05-29 00:00 |
20:56:03.28 |
+42:08:24.2 |
HIP 103269 |
12.95 |
| 2026-05-29 12:00 |
20:56:01.72 |
+42:09:04.5 |
HIP 103269 |
12.26 |
| 2026-05-30 00:00 |
20:56:00.13 |
+42:09:44.5 |
HIP 103269 |
11.57 |
| 2026-05-30 12:00 |
20:55:58.50 |
+42:10:24.2 |
HIP 103269 |
10.89 |
| 2026-05-31 00:00 |
20:55:56.83 |
+42:11:03.7 |
HIP 103269 |
10.21 |
| 2026-05-31 12:00 |
20:55:55.12 |
+42:11:43.0 |
HIP 103269 |
9.53 |
| 2026-06-01 00:00 |
20:55:53.38 |
+42:12:22.0 |
HIP 103269 |
8.86 |
| 2026-06-01 12:00 |
20:55:51.60 |
+42:13:00.8 |
HIP 103269 |
8.20 |
| 2026-06-02 00:00 |
20:55:49.78 |
+42:13:39.4 |
HIP 103269 |
7.54 |