메타데이터
| 항목 |
값 |
| Designation |
123P/West-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-02-04T20:32:10.648320Z |
| Orbit solution date (soln_date, UTC) |
2026-07-07T05:59:09Z |
| Obs used |
3587 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
18.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-01-25.0000000 |
| e |
0.44911568 |
| q (au) |
2.126469 |
| a (au) |
3.860102 |
| i (deg) |
15.358650 |
| Ω (om, deg) |
46.503806 |
| ω (w, deg) |
102.975490 |
| M (ma, deg) |
263.719220 |
밝기
산란 + 전체 선형
$$
M_a = (9.015 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.015 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.747 |
| k |
0.999 |
| 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) |
| 2026-09-20 00:00 |
10:55:51.35 |
+18:06:30.1 |
HIP 53439 |
2.91 |
| 2026-09-20 12:00 |
10:56:56.34 |
+17:59:50.1 |
HIP 53439 |
17.09 |
| 2026-09-21 00:00 |
10:58:01.25 |
+17:53:09.7 |
HIP 53693 |
16.34 |
| 2026-09-21 12:00 |
10:59:06.08 |
+17:46:28.6 |
HIP 53693 |
3.18 |
| 2026-09-22 00:00 |
11:00:10.83 |
+17:39:47.1 |
HIP 53693 |
17.85 |
| 2026-09-22 12:00 |
11:01:15.50 |
+17:33:05.0 |
HIP 53901 |
13.32 |
| 2026-09-23 00:00 |
11:02:20.10 |
+17:26:22.5 |
HIP 53901 |
9.92 |
| 2026-09-23 12:00 |
11:03:24.61 |
+17:19:39.4 |
HIP 54125 |
15.82 |
| 2026-09-24 00:00 |
11:04:29.04 |
+17:12:55.9 |
HIP 54125 |
11.86 |
| 2026-09-24 12:00 |
11:05:33.39 |
+17:06:11.9 |
HIP 54125 |
24.38 |
| 2026-09-25 00:00 |
11:06:37.66 |
+16:59:27.5 |
HIP 54398 |
19.32 |
| 2026-09-25 12:00 |
11:07:41.86 |
+16:52:42.6 |
HIP 54398 |
2.81 |
| 2026-09-26 00:00 |
11:08:45.97 |
+16:45:57.3 |
HIP 54483 |
2.66 |
| 2026-09-26 12:00 |
11:09:50.01 |
+16:39:11.6 |
HIP 54483 |
17.45 |
| 2026-09-27 00:00 |
11:10:53.97 |
+16:32:25.4 |
HIP 54758 |
32.30 |
| 2026-09-27 12:00 |
11:11:57.84 |
+16:25:38.9 |
HIP 54758 |
16.59 |
| 2026-09-28 00:00 |
11:13:01.64 |
+16:18:52.0 |
HIP 54758 |
8.27 |
| 2026-09-28 12:00 |
11:14:05.36 |
+16:12:04.8 |
HIP 54758 |
20.54 |
| 2026-09-29 00:00 |
11:15:09.01 |
+16:05:17.1 |
HIP 54758 |
36.54 |
| 2026-09-29 12:00 |
11:16:12.57 |
+15:58:29.2 |
HIP 55204 |
29.20 |
| 2026-09-30 00:00 |
11:17:16.06 |
+15:51:40.9 |
HIP 55204 |
15.38 |
| 2026-09-30 12:00 |
11:18:19.47 |
+15:44:52.3 |
HIP 55245 |
11.64 |
| 2026-10-01 00:00 |
11:19:22.80 |
+15:38:03.4 |
HIP 55245 |
8.19 |
| 2026-10-01 12:00 |
11:20:26.05 |
+15:31:14.2 |
HIP 55432 |
20.14 |
| 2026-10-02 00:00 |
11:21:29.23 |
+15:24:24.7 |
HIP 55432 |
11.82 |
| 2026-10-02 12:00 |
11:22:32.33 |
+15:17:35.0 |
HIP 55567 |
15.28 |
| 2026-10-03 00:00 |
11:23:35.35 |
+15:10:45.0 |
HIP 55685 |
21.59 |
| 2026-10-03 12:00 |
11:24:38.29 |
+15:03:54.7 |
HIP 55685 |
9.11 |
| 2026-10-04 00:00 |
11:25:41.16 |
+14:57:04.3 |
HIP 55685 |
15.96 |
| 2026-10-04 12:00 |
11:26:43.94 |
+14:50:13.6 |
HIP 55952 |
18.01 |
| 2026-10-05 00:00 |
11:27:46.65 |
+14:43:22.8 |
HIP 55952 |
7.15 |
| 2026-10-05 12:00 |
11:28:49.28 |
+14:36:31.8 |
HIP 55952 |
18.18 |
| 2026-10-06 00:00 |
11:29:51.83 |
+14:29:40.6 |
HIP 56112 |
23.36 |
| 2026-10-06 12:00 |
11:30:54.31 |
+14:22:49.2 |
HIP 56242 |
12.35 |
| 2026-10-07 00:00 |
11:31:56.70 |
+14:15:57.8 |
HIP 56242 |
6.56 |
| 2026-10-07 12:00 |
11:32:59.02 |
+14:09:06.2 |
HIP 56242 |
22.00 |
| 2026-10-08 00:00 |
11:34:01.26 |
+14:02:14.5 |
HIP 56411 |
29.14 |
| 2026-10-08 12:00 |
11:35:03.41 |
+13:55:22.7 |
HIP 56411 |
27.52 |
| 2026-10-09 00:00 |
11:36:05.49 |
+13:48:30.9 |
HIP 56648 |
17.57 |
| 2026-10-09 12:00 |
11:37:07.49 |
+13:41:38.9 |
HIP 56648 |
19.31 |
| 2026-10-10 00:00 |
11:38:09.41 |
+13:34:47.0 |
HIP 56782 |
21.42 |
| 2026-10-10 12:00 |
11:39:11.25 |
+13:27:55.0 |
HIP 56782 |
29.52 |
| 2026-10-11 00:00 |
11:40:13.00 |
+13:21:03.0 |
HIP 56976 |
18.50 |