메타데이터
| 항목 |
값 |
| Designation |
C/2007 Q3 (Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-10-07T06:29:51.262080Z |
| Orbit solution date (soln_date, UTC) |
2025-07-07T14:12:19Z |
| Obs used |
1341 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
5.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-08-20.0000000 |
| e |
1.00023766 |
| q (au) |
2.251688 |
| a (au) |
-9474.438449 |
| i (deg) |
65.650492 |
| Ω (om, deg) |
149.412684 |
| ω (w, deg) |
2.092860 |
| M (ma, deg) |
-0.000052 |
밝기
산란 + 전체 선형
$$
M_a = (7.715 + 2.602\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.715 |
| n |
2.602 |
| gf |
0.999 |
| gb |
-0.644 |
| k |
0.990 |
| 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 |
| 2007-08-25 |
2009-03-15 |
+1.0261 |
-1.390 |
| 2009-03-15 |
2009-05-10 |
+22.4756 |
-12.601 |
| 2009-05-10 |
2009-10-03 |
-25.2024 |
+8.557 |
| 2009-10-10 |
2010-02-28 |
+8.7989 |
-3.980 |
| 2010-02-28 |
2010-06-04 |
+2.9606 |
-2.284 |
| 2010-06-04 |
2010-10-30 |
+3.8990 |
-2.293 |
| 2010-10-30 |
2011-09-25 |
+6.2804 |
-3.627 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
20:50:04.94 |
+08:47:49.0 |
HIP 102795 |
9.97 |
| 2026-07-29 12:00 |
20:50:01.74 |
+08:47:35.7 |
HIP 102795 |
9.21 |
| 2026-07-30 00:00 |
20:49:58.55 |
+08:47:22.3 |
HIP 102795 |
8.47 |
| 2026-07-30 12:00 |
20:49:55.35 |
+08:47:08.6 |
HIP 102795 |
7.73 |
| 2026-07-31 00:00 |
20:49:52.15 |
+08:46:54.7 |
HIP 102795 |
7.01 |
| 2026-07-31 12:00 |
20:49:48.95 |
+08:46:40.7 |
HIP 102795 |
6.31 |
| 2026-08-01 00:00 |
20:49:45.74 |
+08:46:26.4 |
HIP 102795 |
5.64 |
| 2026-08-01 12:00 |
20:49:42.54 |
+08:46:11.9 |
HIP 102795 |
5.02 |
| 2026-08-02 00:00 |
20:49:39.34 |
+08:45:57.3 |
HIP 102795 |
4.46 |
| 2026-08-02 12:00 |
20:49:36.13 |
+08:45:42.4 |
HIP 102795 |
3.99 |
| 2026-08-03 00:00 |
20:49:32.93 |
+08:45:27.3 |
HIP 102795 |
3.65 |
| 2026-08-03 12:00 |
20:49:29.73 |
+08:45:12.1 |
HIP 102795 |
3.48 |
| 2026-08-04 00:00 |
20:49:26.53 |
+08:44:56.6 |
HIP 102795 |
3.50 |
| 2026-08-04 12:00 |
20:49:23.32 |
+08:44:41.0 |
HIP 102795 |
3.71 |
| 2026-08-05 00:00 |
20:49:20.12 |
+08:44:25.2 |
HIP 102795 |
4.07 |
| 2026-08-05 12:00 |
20:49:16.92 |
+08:44:09.1 |
HIP 102795 |
4.56 |
| 2026-08-06 00:00 |
20:49:13.73 |
+08:43:52.9 |
HIP 102795 |
5.14 |
| 2026-08-06 12:00 |
20:49:10.53 |
+08:43:36.5 |
HIP 102795 |
5.78 |
| 2026-08-07 00:00 |
20:49:07.34 |
+08:43:19.9 |
HIP 102795 |
6.46 |
| 2026-08-07 12:00 |
20:49:04.15 |
+08:43:03.1 |
HIP 102795 |
7.18 |
| 2026-08-08 00:00 |
20:49:00.96 |
+08:42:46.2 |
HIP 102795 |
7.92 |
| 2026-08-08 12:00 |
20:48:57.77 |
+08:42:29.0 |
HIP 102795 |
8.67 |
| 2026-08-09 00:00 |
20:48:54.59 |
+08:42:11.7 |
HIP 102795 |
9.44 |
| 2026-08-09 12:00 |
20:48:51.41 |
+08:41:54.1 |
HIP 102795 |
10.22 |
| 2026-08-10 00:00 |
20:48:48.24 |
+08:41:36.4 |
HIP 102795 |
11.00 |
| 2026-08-10 12:00 |
20:48:45.06 |
+08:41:18.5 |
HIP 102795 |
11.79 |
| 2026-08-11 00:00 |
20:48:41.90 |
+08:41:00.5 |
HIP 102795 |
12.59 |
| 2026-08-11 12:00 |
20:48:38.73 |
+08:40:42.2 |
HIP 102795 |
13.39 |
| 2026-08-12 00:00 |
20:48:35.58 |
+08:40:23.8 |
HIP 102795 |
14.20 |
| 2026-08-12 12:00 |
20:48:32.42 |
+08:40:05.2 |
HIP 102795 |
15.01 |
| 2026-08-13 00:00 |
20:48:29.28 |
+08:39:46.4 |
HIP 102795 |
15.82 |
| 2026-08-13 12:00 |
20:48:26.13 |
+08:39:27.5 |
HIP 102795 |
16.63 |
| 2026-08-14 00:00 |
20:48:23.00 |
+08:39:08.3 |
HIP 102795 |
17.44 |
| 2026-08-14 12:00 |
20:48:19.87 |
+08:38:49.0 |
HIP 102795 |
18.26 |
| 2026-08-15 00:00 |
20:48:16.75 |
+08:38:29.6 |
HIP 102795 |
19.07 |
| 2026-08-15 12:00 |
20:48:13.63 |
+08:38:09.9 |
HIP 102795 |
19.89 |
| 2026-08-16 00:00 |
20:48:10.52 |
+08:37:50.1 |
HIP 102606 |
19.64 |
| 2026-08-16 12:00 |
20:48:07.42 |
+08:37:30.2 |
HIP 102606 |
19.01 |
| 2026-08-17 00:00 |
20:48:04.32 |
+08:37:10.0 |
HIP 102606 |
18.40 |
| 2026-08-17 12:00 |
20:48:01.24 |
+08:36:49.7 |
HIP 102606 |
17.81 |
| 2026-08-18 00:00 |
20:47:58.16 |
+08:36:29.3 |
HIP 102606 |
17.23 |
| 2026-08-18 12:00 |
20:47:55.09 |
+08:36:08.7 |
HIP 102606 |
16.68 |
| 2026-08-19 00:00 |
20:47:52.03 |
+08:35:47.9 |
HIP 102606 |
16.14 |