189P/NEAT
메타데이터
| 항목 |
값 |
| Designation |
189P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-07-25T22:31:20.040960Z |
| Orbit solution date (soln_date, UTC) |
2022-08-26T23:43:11Z |
| Obs used |
1469 |
| NEO |
Yes |
| M1 |
19.100 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2008-12-04.0000000 |
| e |
0.59764285 |
| q (au) |
1.173925 |
| a (au) |
2.917619 |
| i (deg) |
20.400629 |
| Ω (om, deg) |
282.200061 |
| ω (w, deg) |
15.307418 |
| M (ma, deg) |
98.304051 |
밝기
산란 + 전체 선형
$$
M_a = (19.737 + 2.780\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
19.737 |
| n |
2.780 |
| gf |
1.000 |
| gb |
-0.866 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:08:52.05 |
-00:21:40.2 |
HIP 44953 |
9.78 |
| 2026-02-03 12:00 |
09:08:26.87 |
-00:20:53.2 |
HIP 44953 |
16.10 |
| 2026-02-04 00:00 |
09:08:01.65 |
-00:20:04.6 |
HIP 44953 |
22.45 |
| 2026-02-04 12:00 |
09:07:36.40 |
-00:19:14.7 |
HIP 44777 |
23.05 |
| 2026-02-05 00:00 |
09:07:11.13 |
-00:18:23.3 |
HIP 44777 |
22.86 |
| 2026-02-05 12:00 |
09:06:45.83 |
-00:17:30.5 |
HIP 44777 |
24.37 |
| 2026-02-06 00:00 |
09:06:20.51 |
-00:16:36.4 |
HIP 44577 |
22.94 |
| 2026-02-06 12:00 |
09:05:55.18 |
-00:15:40.8 |
HIP 44577 |
17.86 |
| 2026-02-07 00:00 |
09:05:29.84 |
-00:14:43.9 |
HIP 44577 |
13.93 |
| 2026-02-07 12:00 |
09:05:04.50 |
-00:13:45.7 |
HIP 44577 |
12.32 |
| 2026-02-08 00:00 |
09:04:39.15 |
-00:12:46.0 |
HIP 44577 |
13.86 |
| 2026-02-08 12:00 |
09:04:13.81 |
-00:11:45.1 |
HIP 44577 |
17.77 |
| 2026-02-09 00:00 |
09:03:48.48 |
-00:10:42.9 |
HIP 44577 |
22.85 |
| 2026-02-09 12:00 |
09:03:23.16 |
-00:09:39.3 |
HIP 44577 |
28.48 |
| 2026-02-10 00:00 |
09:02:57.86 |
-00:08:34.5 |
HIP 44322 |
22.26 |
| 2026-02-10 12:00 |
09:02:32.57 |
-00:07:28.4 |
HIP 44322 |
16.06 |
| 2026-02-11 00:00 |
09:02:07.32 |
-00:06:21.1 |
HIP 44322 |
10.12 |
| 2026-02-11 12:00 |
09:01:42.09 |
-00:05:12.6 |
HIP 44322 |
5.40 |
| 2026-02-12 00:00 |
09:01:16.91 |
-00:04:02.8 |
HIP 44322 |
6.14 |
| 2026-02-12 12:00 |
09:00:51.76 |
-00:02:51.8 |
HIP 44322 |
11.32 |
| 2026-02-13 00:00 |
09:00:26.65 |
-00:01:39.7 |
HIP 44227 |
11.11 |
| 2026-02-13 12:00 |
09:00:01.60 |
-00:00:26.4 |
HIP 44227 |
12.12 |
| 2026-02-14 00:00 |
08:59:36.59 |
+00:00:48.1 |
HIP 44123 |
8.58 |
| 2026-02-14 12:00 |
08:59:11.65 |
+00:02:03.6 |
HIP 44123 |
4.16 |
| 2026-02-15 00:00 |
08:58:46.77 |
+00:03:20.3 |
HIP 44123 |
6.45 |
| 2026-02-15 12:00 |
08:58:21.95 |
+00:04:38.0 |
HIP 44123 |
12.09 |
| 2026-02-16 00:00 |
08:57:57.21 |
+00:05:56.8 |
HIP 44123 |
18.18 |
| 2026-02-16 12:00 |
08:57:32.54 |
+00:07:16.7 |
HIP 43913 |
19.96 |
| 2026-02-17 00:00 |
08:57:07.96 |
+00:08:37.5 |
HIP 43913 |
15.81 |
| 2026-02-17 12:00 |
08:56:43.46 |
+00:09:59.4 |
HIP 43913 |
13.43 |
| 2026-02-18 00:00 |
08:56:19.05 |
+00:11:22.2 |
HIP 43913 |
13.74 |
| 2026-02-18 12:00 |
08:55:54.73 |
+00:12:46.0 |
HIP 43913 |
16.57 |
| 2026-02-19 00:00 |
08:55:30.51 |
+00:14:10.7 |
HIP 43913 |
20.90 |
| 2026-02-19 12:00 |
08:55:06.39 |
+00:15:36.4 |
HIP 43913 |
25.98 |
| 2026-02-20 00:00 |
08:54:42.38 |
+00:17:02.9 |
HIP 43913 |
31.43 |
| 2026-02-20 12:00 |
08:54:18.49 |
+00:18:30.3 |
HIP 43612 |
34.55 |
| 2026-02-21 00:00 |
08:53:54.70 |
+00:19:58.5 |
HIP 43612 |
32.76 |
| 2026-02-21 12:00 |
08:53:31.04 |
+00:21:27.6 |
HIP 43612 |
32.07 |
| 2026-02-22 00:00 |
08:53:07.50 |
+00:22:57.4 |
HIP 43456 |
31.26 |
| 2026-02-22 12:00 |
08:52:44.09 |
+00:24:28.0 |
HIP 43456 |
25.24 |
| 2026-02-23 00:00 |
08:52:20.81 |
+00:25:59.4 |
HIP 43456 |
19.27 |
| 2026-02-23 12:00 |
08:51:57.67 |
+00:27:31.5 |
HIP 43456 |
13.37 |
| 2026-02-24 00:00 |
08:51:34.66 |
+00:29:04.3 |
HIP 43456 |
7.66 |