C/2009 F4 (McNaught)
메타데이터
| 항목 |
값 |
| Designation |
C/2009 F4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-31T20:49:26.964480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
1187 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
7.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-10-20.0000000 |
| e |
1.00181059 |
| q (au) |
5.454873 |
| a (au) |
-3012.758168 |
| i (deg) |
79.347294 |
| Ω (om, deg) |
53.583284 |
| ω (w, deg) |
260.381258 |
| M (ma, deg) |
-0.000434 |
밝기
산란 + 전체 선형
$$
M_a = (-0.682 + 5.729\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-0.682 |
| n |
5.729 |
| gf |
0.914 |
| gb |
-0.944 |
| k |
1.000 |
| δ90 |
7.671 |
| 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) |
| 2026-02-03 00:00 |
03:02:57.28 |
+46:34:01.5 |
HIP 14336 |
23.91 |
| 2026-02-03 12:00 |
03:02:56.76 |
+46:33:36.4 |
HIP 14336 |
23.75 |
| 2026-02-04 00:00 |
03:02:56.29 |
+46:33:11.5 |
HIP 14336 |
23.59 |
| 2026-02-04 12:00 |
03:02:55.87 |
+46:32:46.7 |
HIP 14336 |
23.42 |
| 2026-02-05 00:00 |
03:02:55.50 |
+46:32:22.1 |
HIP 14336 |
23.26 |
| 2026-02-05 12:00 |
03:02:55.19 |
+46:31:57.6 |
HIP 14336 |
23.10 |
| 2026-02-06 00:00 |
03:02:54.93 |
+46:31:33.2 |
HIP 14336 |
22.94 |
| 2026-02-06 12:00 |
03:02:54.72 |
+46:31:09.0 |
HIP 14336 |
22.77 |
| 2026-02-07 00:00 |
03:02:54.56 |
+46:30:44.9 |
HIP 14336 |
22.61 |
| 2026-02-07 12:00 |
03:02:54.45 |
+46:30:21.0 |
HIP 14336 |
22.44 |
| 2026-02-08 00:00 |
03:02:54.39 |
+46:29:57.2 |
HIP 14336 |
22.28 |
| 2026-02-08 12:00 |
03:02:54.39 |
+46:29:33.6 |
HIP 14336 |
22.11 |
| 2026-02-09 00:00 |
03:02:54.44 |
+46:29:10.2 |
HIP 14336 |
21.94 |
| 2026-02-09 12:00 |
03:02:54.54 |
+46:28:46.8 |
HIP 14336 |
21.77 |
| 2026-02-10 00:00 |
03:02:54.69 |
+46:28:23.7 |
HIP 14336 |
21.60 |
| 2026-02-10 12:00 |
03:02:54.89 |
+46:28:00.7 |
HIP 14336 |
21.43 |
| 2026-02-11 00:00 |
03:02:55.14 |
+46:27:37.9 |
HIP 14336 |
21.26 |
| 2026-02-11 12:00 |
03:02:55.45 |
+46:27:15.2 |
HIP 14336 |
21.08 |
| 2026-02-12 00:00 |
03:02:55.80 |
+46:26:52.7 |
HIP 14336 |
20.90 |
| 2026-02-12 12:00 |
03:02:56.21 |
+46:26:30.4 |
HIP 14336 |
20.72 |
| 2026-02-13 00:00 |
03:02:56.67 |
+46:26:08.3 |
HIP 14336 |
20.54 |
| 2026-02-13 12:00 |
03:02:57.18 |
+46:25:46.3 |
HIP 14336 |
20.35 |
| 2026-02-14 00:00 |
03:02:57.73 |
+46:25:24.5 |
HIP 14336 |
20.16 |
| 2026-02-14 12:00 |
03:02:58.34 |
+46:25:02.9 |
HIP 14336 |
19.97 |
| 2026-02-15 00:00 |
03:02:59.00 |
+46:24:41.5 |
HIP 14336 |
19.78 |
| 2026-02-15 12:00 |
03:02:59.71 |
+46:24:20.2 |
HIP 14336 |
19.58 |
| 2026-02-16 00:00 |
03:03:00.48 |
+46:23:59.1 |
HIP 14336 |
19.39 |
| 2026-02-16 12:00 |
03:03:01.29 |
+46:23:38.3 |
HIP 14336 |
19.19 |
| 2026-02-17 00:00 |
03:03:02.15 |
+46:23:17.6 |
HIP 14336 |
18.98 |
| 2026-02-17 12:00 |
03:03:03.06 |
+46:22:57.1 |
HIP 14336 |
18.78 |
| 2026-02-18 00:00 |
03:03:04.02 |
+46:22:36.8 |
HIP 14336 |
18.57 |
| 2026-02-18 12:00 |
03:03:05.03 |
+46:22:16.7 |
HIP 14336 |
18.35 |
| 2026-02-19 00:00 |
03:03:06.09 |
+46:21:56.7 |
HIP 14336 |
18.14 |
| 2026-02-19 12:00 |
03:03:07.20 |
+46:21:37.0 |
HIP 14336 |
17.92 |
| 2026-02-20 00:00 |
03:03:08.35 |
+46:21:17.5 |
HIP 14336 |
17.70 |
| 2026-02-20 12:00 |
03:03:09.56 |
+46:20:58.2 |
HIP 14336 |
17.48 |
| 2026-02-21 00:00 |
03:03:10.81 |
+46:20:39.1 |
HIP 14336 |
17.25 |
| 2026-02-21 12:00 |
03:03:12.12 |
+46:20:20.2 |
HIP 14336 |
17.02 |
| 2026-02-22 00:00 |
03:03:13.47 |
+46:20:01.5 |
HIP 14336 |
16.79 |
| 2026-02-22 12:00 |
03:03:14.87 |
+46:19:43.0 |
HIP 14336 |
16.56 |
| 2026-02-23 00:00 |
03:03:16.31 |
+46:19:24.8 |
HIP 14336 |
16.32 |
| 2026-02-23 12:00 |
03:03:17.81 |
+46:19:06.7 |
HIP 14336 |
16.08 |
| 2026-02-24 00:00 |
03:03:19.35 |
+46:18:48.8 |
HIP 14336 |
15.84 |