메타데이터
| 항목 |
값 |
| Designation |
205P/Giacobini |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-05-14T00:01:56.562240Z |
| Orbit solution date (soln_date, UTC) |
2023-07-20T15:02:32Z |
| Obs used |
564 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
9.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2014-02-19.0000000 |
| e |
0.56693106 |
| q (au) |
1.536180 |
| a (au) |
3.547195 |
| i (deg) |
15.287237 |
| Ω (om, deg) |
179.624626 |
| ω (w, deg) |
154.256561 |
| M (ma, deg) |
293.759426 |
밝기
산란 + 전체 선형
$$
M_a = (14.018 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.018 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.635 |
| k |
0.800 |
| 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 |
| 2021-05-14 |
2021-11-14 |
+11.4692 |
-2.714 |
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 |
11:19:21.83 |
+03:44:47.2 |
HIP 55324 |
9.41 |
| 2026-07-29 12:00 |
11:19:41.57 |
+03:43:11.3 |
HIP 55324 |
5.97 |
| 2026-07-30 00:00 |
11:20:01.38 |
+03:41:34.7 |
HIP 55324 |
6.03 |
| 2026-07-30 12:00 |
11:20:21.28 |
+03:39:57.6 |
HIP 55324 |
9.56 |
| 2026-07-31 00:00 |
11:20:41.25 |
+03:38:19.9 |
HIP 55324 |
14.20 |
| 2026-07-31 12:00 |
11:21:01.29 |
+03:36:41.6 |
HIP 55324 |
19.17 |
| 2026-08-01 00:00 |
11:21:21.41 |
+03:35:02.7 |
HIP 55460 |
21.29 |
| 2026-08-01 12:00 |
11:21:41.61 |
+03:33:23.3 |
HIP 55460 |
23.06 |
| 2026-08-02 00:00 |
11:22:01.88 |
+03:31:43.3 |
HIP 55460 |
25.84 |
| 2026-08-02 12:00 |
11:22:22.22 |
+03:30:02.8 |
HIP 55638 |
23.46 |
| 2026-08-03 00:00 |
11:22:42.63 |
+03:28:21.6 |
HIP 55638 |
19.37 |
| 2026-08-03 12:00 |
11:23:03.12 |
+03:26:40.0 |
HIP 55638 |
16.05 |
| 2026-08-04 00:00 |
11:23:23.68 |
+03:24:57.8 |
HIP 55638 |
14.07 |
| 2026-08-04 12:00 |
11:23:44.31 |
+03:23:15.0 |
HIP 55638 |
14.03 |
| 2026-08-05 00:00 |
11:24:05.00 |
+03:21:31.7 |
HIP 55638 |
15.97 |
| 2026-08-05 12:00 |
11:24:25.77 |
+03:19:47.8 |
HIP 55769 |
18.47 |
| 2026-08-06 00:00 |
11:24:46.61 |
+03:18:03.5 |
HIP 55769 |
13.19 |
| 2026-08-06 12:00 |
11:25:07.52 |
+03:16:18.6 |
HIP 55769 |
8.17 |
| 2026-08-07 00:00 |
11:25:28.50 |
+03:14:33.1 |
HIP 55769 |
4.46 |
| 2026-08-07 12:00 |
11:25:49.54 |
+03:12:47.2 |
HIP 55769 |
5.86 |
| 2026-08-08 00:00 |
11:26:10.65 |
+03:11:00.7 |
HIP 55769 |
10.51 |
| 2026-08-08 12:00 |
11:26:31.83 |
+03:09:13.7 |
HIP 55846 |
9.15 |
| 2026-08-09 00:00 |
11:26:53.07 |
+03:07:26.2 |
HIP 55846 |
6.92 |
| 2026-08-09 12:00 |
11:27:14.38 |
+03:05:38.2 |
HIP 55846 |
8.65 |
| 2026-08-10 00:00 |
11:27:35.75 |
+03:03:49.7 |
HIP 55848 |
12.73 |
| 2026-08-10 12:00 |
11:27:57.19 |
+03:02:00.7 |
HIP 55945 |
10.64 |
| 2026-08-11 00:00 |
11:28:18.69 |
+03:00:11.2 |
HIP 55945 |
10.44 |
| 2026-08-11 12:00 |
11:28:40.25 |
+02:58:21.3 |
HIP 55982 |
11.98 |
| 2026-08-12 00:00 |
11:29:01.88 |
+02:56:30.8 |
HIP 56029 |
12.46 |
| 2026-08-12 12:00 |
11:29:23.56 |
+02:54:39.9 |
HIP 56029 |
12.05 |
| 2026-08-13 00:00 |
11:29:45.31 |
+02:52:48.5 |
HIP 56029 |
14.16 |
| 2026-08-13 12:00 |
11:30:07.12 |
+02:50:56.7 |
HIP 56029 |
17.95 |
| 2026-08-14 00:00 |
11:30:28.99 |
+02:49:04.4 |
HIP 56209 |
20.00 |
| 2026-08-14 12:00 |
11:30:50.91 |
+02:47:11.7 |
HIP 56209 |
18.44 |
| 2026-08-15 00:00 |
11:31:12.89 |
+02:45:18.5 |
HIP 56209 |
18.64 |
| 2026-08-15 12:00 |
11:31:34.93 |
+02:43:24.8 |
HIP 56209 |
20.55 |
| 2026-08-16 00:00 |
11:31:57.03 |
+02:41:30.8 |
HIP 56209 |
23.79 |
| 2026-08-16 12:00 |
11:32:19.18 |
+02:39:36.3 |
HIP 56376 |
19.74 |
| 2026-08-17 00:00 |
11:32:41.39 |
+02:37:41.3 |
HIP 56376 |
14.26 |
| 2026-08-17 12:00 |
11:33:03.65 |
+02:35:46.0 |
HIP 56376 |
9.25 |
| 2026-08-18 00:00 |
11:33:25.97 |
+02:33:50.2 |
HIP 56388 |
4.67 |
| 2026-08-18 12:00 |
11:33:48.34 |
+02:31:54.1 |
HIP 56388 |
3.58 |
| 2026-08-19 00:00 |
11:34:10.76 |
+02:29:57.5 |
HIP 56388 |
8.60 |