메타데이터
| 항목 |
값 |
| Designation |
C/2008 P1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-07-22T22:51:56.433600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:21Z |
| Obs used |
1345 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-08-25.0000000 |
| e |
1.00167859 |
| q (au) |
3.896111 |
| a (au) |
-2321.061664 |
| i (deg) |
64.310315 |
| Ω (om, deg) |
357.676994 |
| ω (w, deg) |
11.865464 |
| M (ma, deg) |
0.000291 |
밝기
산란 + 전체 선형
$$
M_a = (10.382 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.382 |
| n |
2.000 |
| gf |
0.960 |
| gb |
-0.747 |
| k |
1.000 |
| δ90 |
9.885 |
| 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 |
| 2008-08-13 |
2009-07-21 |
-8.6915 |
+4.482 |
| 2009-07-23 |
2011-02-04 |
+5.2294 |
-3.081 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:46:49.68 |
+27:52:30.4 |
HIP 57324 |
25.94 |
| 2026-09-20 12:00 |
11:46:53.21 |
+27:52:08.9 |
HIP 57324 |
26.78 |
| 2026-09-21 00:00 |
11:46:56.73 |
+27:51:47.6 |
HIP 57324 |
27.62 |
| 2026-09-21 12:00 |
11:47:00.25 |
+27:51:26.4 |
HIP 57517 |
27.95 |
| 2026-09-22 00:00 |
11:47:03.77 |
+27:51:05.5 |
HIP 57517 |
27.49 |
| 2026-09-22 12:00 |
11:47:07.29 |
+27:50:44.8 |
HIP 57517 |
27.06 |
| 2026-09-23 00:00 |
11:47:10.81 |
+27:50:24.3 |
HIP 57517 |
26.65 |
| 2026-09-23 12:00 |
11:47:14.32 |
+27:50:03.9 |
HIP 57517 |
26.26 |
| 2026-09-24 00:00 |
11:47:17.84 |
+27:49:43.8 |
HIP 57517 |
25.90 |
| 2026-09-24 12:00 |
11:47:21.35 |
+27:49:23.9 |
HIP 57517 |
25.56 |
| 2026-09-25 00:00 |
11:47:24.85 |
+27:49:04.1 |
HIP 57517 |
25.25 |
| 2026-09-25 12:00 |
11:47:28.36 |
+27:48:44.6 |
HIP 57517 |
24.97 |
| 2026-09-26 00:00 |
11:47:31.86 |
+27:48:25.2 |
HIP 57517 |
24.72 |
| 2026-09-26 12:00 |
11:47:35.36 |
+27:48:06.1 |
HIP 57517 |
24.50 |
| 2026-09-27 00:00 |
11:47:38.85 |
+27:47:47.2 |
HIP 57568 |
24.27 |
| 2026-09-27 12:00 |
11:47:42.34 |
+27:47:28.4 |
HIP 57568 |
23.83 |
| 2026-09-28 00:00 |
11:47:45.83 |
+27:47:09.9 |
HIP 57568 |
23.41 |
| 2026-09-28 12:00 |
11:47:49.31 |
+27:46:51.6 |
HIP 57568 |
23.01 |
| 2026-09-29 00:00 |
11:47:52.79 |
+27:46:33.5 |
HIP 57568 |
22.65 |
| 2026-09-29 12:00 |
11:47:56.26 |
+27:46:15.6 |
HIP 57568 |
22.31 |
| 2026-09-30 00:00 |
11:47:59.73 |
+27:45:57.9 |
HIP 57568 |
22.00 |
| 2026-09-30 12:00 |
11:48:03.20 |
+27:45:40.4 |
HIP 57568 |
21.72 |
| 2026-10-01 00:00 |
11:48:06.65 |
+27:45:23.1 |
HIP 57568 |
21.47 |
| 2026-10-01 12:00 |
11:48:10.11 |
+27:45:06.1 |
HIP 57568 |
21.25 |
| 2026-10-02 00:00 |
11:48:13.55 |
+27:44:49.2 |
HIP 57568 |
21.07 |
| 2026-10-02 12:00 |
11:48:16.99 |
+27:44:32.6 |
HIP 57568 |
20.91 |
| 2026-10-03 00:00 |
11:48:20.43 |
+27:44:16.2 |
HIP 57568 |
20.80 |
| 2026-10-03 12:00 |
11:48:23.86 |
+27:44:00.0 |
HIP 57568 |
20.71 |
| 2026-10-04 00:00 |
11:48:27.28 |
+27:43:44.0 |
HIP 57568 |
20.67 |
| 2026-10-04 12:00 |
11:48:30.69 |
+27:43:28.2 |
HIP 57568 |
20.65 |
| 2026-10-05 00:00 |
11:48:34.10 |
+27:43:12.7 |
HIP 57568 |
20.67 |
| 2026-10-05 12:00 |
11:48:37.50 |
+27:42:57.4 |
HIP 57568 |
20.72 |
| 2026-10-06 00:00 |
11:48:40.89 |
+27:42:42.3 |
HIP 57568 |
20.81 |
| 2026-10-06 12:00 |
11:48:44.28 |
+27:42:27.4 |
HIP 57568 |
20.93 |
| 2026-10-07 00:00 |
11:48:47.65 |
+27:42:12.7 |
HIP 57568 |
21.08 |
| 2026-10-07 12:00 |
11:48:51.02 |
+27:41:58.3 |
HIP 57568 |
21.26 |
| 2026-10-08 00:00 |
11:48:54.38 |
+27:41:44.1 |
HIP 57568 |
21.47 |
| 2026-10-08 12:00 |
11:48:57.73 |
+27:41:30.1 |
HIP 57568 |
21.70 |
| 2026-10-09 00:00 |
11:49:01.07 |
+27:41:16.4 |
HIP 57568 |
21.97 |
| 2026-10-09 12:00 |
11:49:04.40 |
+27:41:02.9 |
HIP 57568 |
22.26 |
| 2026-10-10 00:00 |
11:49:07.72 |
+27:40:49.6 |
HIP 57568 |
22.57 |
| 2026-10-10 12:00 |
11:49:11.04 |
+27:40:36.6 |
HIP 57568 |
22.91 |
| 2026-10-11 00:00 |
11:49:14.34 |
+27:40:23.8 |
HIP 57568 |
23.26 |