C/2005 S4 (McNaught)
메타데이터
| 항목 |
값 |
| Designation |
C/2005 S4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-07-18T15:31:21.316800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:53Z |
| Obs used |
580 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
5.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2007-06-06.0000000 |
| e |
0.99897119 |
| q (au) |
5.850108 |
| a (au) |
5686.269098 |
| i (deg) |
107.958958 |
| Ω (om, deg) |
318.290291 |
| ω (w, deg) |
31.453945 |
| M (ma, deg) |
359.999902 |
밝기
산란 + 전체 선형
$$
M_a = (6.966 + 3.745\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.966 |
| n |
3.745 |
| gf |
0.995 |
| gb |
-0.897 |
| k |
0.999 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2005-07-27 |
2007-07-16 |
-1.0253 |
+0.679 |
| 2007-07-19 |
2008-10-06 |
+18.7523 |
-14.647 |
| 2008-10-06 |
2009-07-23 |
+4.6293 |
-3.301 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
10:10:18.91 |
+29:07:22.0 |
HIP 49947 |
29.19 |
| 2026-02-03 12:00 |
10:10:14.98 |
+29:07:40.0 |
HIP 49947 |
29.58 |
| 2026-02-04 00:00 |
10:10:11.04 |
+29:07:57.9 |
HIP 49947 |
29.99 |
| 2026-02-04 12:00 |
10:10:07.09 |
+29:08:15.6 |
HIP 49947 |
30.42 |
| 2026-02-05 00:00 |
10:10:03.13 |
+29:08:33.3 |
HIP 49947 |
30.88 |
| 2026-02-05 12:00 |
10:09:59.16 |
+29:08:50.9 |
HIP 49947 |
31.36 |
| 2026-02-06 00:00 |
10:09:55.18 |
+29:09:08.3 |
HIP 49947 |
31.86 |
| 2026-02-06 12:00 |
10:09:51.20 |
+29:09:25.6 |
HIP 49947 |
32.39 |
| 2026-02-07 00:00 |
10:09:47.21 |
+29:09:42.9 |
HIP 49947 |
32.93 |
| 2026-02-07 12:00 |
10:09:43.21 |
+29:10:00.0 |
HIP 49580 |
32.67 |
| 2026-02-08 00:00 |
10:09:39.20 |
+29:10:17.0 |
HIP 49580 |
31.76 |
| 2026-02-08 12:00 |
10:09:35.18 |
+29:10:33.8 |
HIP 49580 |
30.86 |
| 2026-02-09 00:00 |
10:09:31.16 |
+29:10:50.6 |
HIP 49580 |
29.95 |
| 2026-02-09 12:00 |
10:09:27.14 |
+29:11:07.3 |
HIP 49580 |
29.05 |
| 2026-02-10 00:00 |
10:09:23.10 |
+29:11:23.8 |
HIP 49580 |
28.14 |
| 2026-02-10 12:00 |
10:09:19.06 |
+29:11:40.2 |
HIP 49580 |
27.24 |
| 2026-02-11 00:00 |
10:09:15.02 |
+29:11:56.4 |
HIP 49580 |
26.33 |
| 2026-02-11 12:00 |
10:09:10.97 |
+29:12:12.6 |
HIP 49580 |
25.43 |
| 2026-02-12 00:00 |
10:09:06.92 |
+29:12:28.6 |
HIP 49580 |
24.53 |
| 2026-02-12 12:00 |
10:09:02.86 |
+29:12:44.5 |
HIP 49580 |
23.63 |
| 2026-02-13 00:00 |
10:08:58.80 |
+29:13:00.3 |
HIP 49580 |
22.73 |
| 2026-02-13 12:00 |
10:08:54.73 |
+29:13:15.9 |
HIP 49580 |
21.83 |
| 2026-02-14 00:00 |
10:08:50.66 |
+29:13:31.4 |
HIP 49580 |
20.93 |
| 2026-02-14 12:00 |
10:08:46.59 |
+29:13:46.7 |
HIP 49580 |
20.03 |
| 2026-02-15 00:00 |
10:08:42.51 |
+29:14:01.9 |
HIP 49580 |
19.14 |
| 2026-02-15 12:00 |
10:08:38.44 |
+29:14:17.0 |
HIP 49580 |
18.25 |
| 2026-02-16 00:00 |
10:08:34.36 |
+29:14:31.9 |
HIP 49580 |
17.36 |
| 2026-02-16 12:00 |
10:08:30.28 |
+29:14:46.7 |
HIP 49580 |
16.47 |
| 2026-02-17 00:00 |
10:08:26.19 |
+29:15:01.3 |
HIP 49580 |
15.59 |
| 2026-02-17 12:00 |
10:08:22.11 |
+29:15:15.8 |
HIP 49580 |
14.72 |
| 2026-02-18 00:00 |
10:08:18.03 |
+29:15:30.2 |
HIP 49580 |
13.85 |
| 2026-02-18 12:00 |
10:08:13.94 |
+29:15:44.4 |
HIP 49580 |
12.99 |
| 2026-02-19 00:00 |
10:08:09.86 |
+29:15:58.4 |
HIP 49580 |
12.13 |
| 2026-02-19 12:00 |
10:08:05.78 |
+29:16:12.3 |
HIP 49580 |
11.29 |
| 2026-02-20 00:00 |
10:08:01.69 |
+29:16:26.0 |
HIP 49580 |
10.46 |
| 2026-02-20 12:00 |
10:07:57.61 |
+29:16:39.6 |
HIP 49580 |
9.64 |
| 2026-02-21 00:00 |
10:07:53.53 |
+29:16:53.0 |
HIP 49580 |
8.85 |
| 2026-02-21 12:00 |
10:07:49.46 |
+29:17:06.3 |
HIP 49580 |
8.08 |
| 2026-02-22 00:00 |
10:07:45.38 |
+29:17:19.4 |
HIP 49580 |
7.34 |
| 2026-02-22 12:00 |
10:07:41.31 |
+29:17:32.3 |
HIP 49580 |
6.65 |
| 2026-02-23 00:00 |
10:07:37.23 |
+29:17:45.1 |
HIP 49580 |
6.01 |
| 2026-02-23 12:00 |
10:07:33.17 |
+29:17:57.7 |
HIP 49580 |
5.45 |
| 2026-02-24 00:00 |
10:07:29.10 |
+29:18:10.2 |
HIP 49580 |
5.00 |