메타데이터
| 항목 |
값 |
| Designation |
P/2009 T2 (La Sagra) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-01-12T20:11:46.766400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:35Z |
| Obs used |
882 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-11-18.0000000 |
| e |
0.76899059 |
| q (au) |
1.754750 |
| a (au) |
7.596009 |
| i (deg) |
28.106386 |
| Ω (om, deg) |
215.985632 |
| ω (w, deg) |
215.470914 |
| M (ma, deg) |
357.371046 |
밝기
산란 + 전체 선형
$$
M_a = (12.467 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.467 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.867 |
| k |
0.998 |
| δ90 |
1.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:57:45.19 |
+02:11:07.1 |
HIP 87939 |
4.34 |
| 2026-07-29 12:00 |
17:57:37.56 |
+02:10:31.3 |
HIP 87939 |
5.77 |
| 2026-07-30 00:00 |
17:57:30.00 |
+02:09:55.0 |
HIP 87939 |
7.46 |
| 2026-07-30 12:00 |
17:57:22.49 |
+02:09:18.1 |
HIP 87939 |
9.26 |
| 2026-07-31 00:00 |
17:57:15.06 |
+02:08:40.8 |
HIP 87939 |
11.10 |
| 2026-07-31 12:00 |
17:57:07.69 |
+02:08:03.0 |
HIP 87939 |
12.98 |
| 2026-08-01 00:00 |
17:57:00.38 |
+02:07:24.7 |
HIP 87939 |
14.86 |
| 2026-08-01 12:00 |
17:56:53.15 |
+02:06:45.9 |
HIP 87939 |
16.74 |
| 2026-08-02 00:00 |
17:56:45.98 |
+02:06:06.7 |
HIP 87761 |
17.18 |
| 2026-08-02 12:00 |
17:56:38.88 |
+02:05:27.0 |
HIP 87761 |
15.36 |
| 2026-08-03 00:00 |
17:56:31.84 |
+02:04:46.8 |
HIP 87761 |
13.58 |
| 2026-08-03 12:00 |
17:56:24.88 |
+02:04:06.1 |
HIP 87761 |
11.84 |
| 2026-08-04 00:00 |
17:56:17.99 |
+02:03:25.0 |
HIP 87761 |
10.17 |
| 2026-08-04 12:00 |
17:56:11.17 |
+02:02:43.5 |
HIP 87761 |
8.60 |
| 2026-08-05 00:00 |
17:56:04.42 |
+02:02:01.5 |
HIP 87761 |
7.16 |
| 2026-08-05 12:00 |
17:55:57.75 |
+02:01:19.0 |
HIP 87761 |
5.97 |
| 2026-08-06 00:00 |
17:55:51.15 |
+02:00:36.1 |
HIP 87761 |
5.17 |
| 2026-08-06 12:00 |
17:55:44.62 |
+01:59:52.8 |
HIP 87761 |
4.95 |
| 2026-08-07 00:00 |
17:55:38.16 |
+01:59:09.0 |
HIP 87761 |
5.35 |
| 2026-08-07 12:00 |
17:55:31.79 |
+01:58:24.8 |
HIP 87761 |
6.25 |
| 2026-08-08 00:00 |
17:55:25.48 |
+01:57:40.2 |
HIP 87761 |
7.46 |
| 2026-08-08 12:00 |
17:55:19.26 |
+01:56:55.2 |
HIP 87761 |
8.84 |
| 2026-08-09 00:00 |
17:55:13.11 |
+01:56:09.7 |
HIP 87761 |
10.32 |
| 2026-08-09 12:00 |
17:55:07.04 |
+01:55:23.9 |
HIP 87761 |
11.86 |
| 2026-08-10 00:00 |
17:55:01.04 |
+01:54:37.6 |
HIP 87761 |
13.43 |
| 2026-08-10 12:00 |
17:54:55.13 |
+01:53:51.0 |
HIP 87761 |
15.02 |
| 2026-08-11 00:00 |
17:54:49.29 |
+01:53:03.9 |
HIP 87761 |
16.61 |
| 2026-08-11 12:00 |
17:54:43.54 |
+01:52:16.4 |
HIP 87761 |
18.20 |
| 2026-08-12 00:00 |
17:54:37.87 |
+01:51:28.6 |
HIP 87761 |
19.79 |
| 2026-08-12 12:00 |
17:54:32.27 |
+01:50:40.4 |
HIP 87761 |
21.37 |
| 2026-08-13 00:00 |
17:54:26.76 |
+01:49:51.8 |
HIP 87761 |
22.95 |
| 2026-08-13 12:00 |
17:54:21.34 |
+01:49:02.9 |
HIP 87761 |
24.51 |
| 2026-08-14 00:00 |
17:54:15.99 |
+01:48:13.6 |
HIP 87761 |
26.07 |
| 2026-08-14 12:00 |
17:54:10.73 |
+01:47:23.9 |
HIP 87490 |
24.61 |
| 2026-08-15 00:00 |
17:54:05.56 |
+01:46:33.9 |
HIP 87490 |
23.19 |
| 2026-08-15 12:00 |
17:54:00.46 |
+01:45:43.6 |
HIP 87490 |
21.80 |
| 2026-08-16 00:00 |
17:53:55.46 |
+01:44:52.9 |
HIP 87490 |
20.45 |
| 2026-08-16 12:00 |
17:53:50.53 |
+01:44:01.8 |
HIP 87490 |
19.15 |
| 2026-08-17 00:00 |
17:53:45.70 |
+01:43:10.5 |
HIP 87490 |
17.89 |
| 2026-08-17 12:00 |
17:53:40.95 |
+01:42:18.8 |
HIP 87490 |
16.70 |
| 2026-08-18 00:00 |
17:53:36.28 |
+01:41:26.8 |
HIP 87490 |
15.57 |
| 2026-08-18 12:00 |
17:53:31.71 |
+01:40:34.5 |
HIP 87490 |
14.52 |
| 2026-08-19 00:00 |
17:53:27.22 |
+01:39:41.9 |
HIP 87490 |
13.57 |