메타데이터
| 항목 |
값 |
| Designation |
97P/Metcalf-Brewington |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-02-20T14:52:28.525440Z |
| Orbit solution date (soln_date, UTC) |
2024-04-18T00:13:54Z |
| Obs used |
391 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
7.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-04-13.0000000 |
| e |
0.45694184 |
| q (au) |
2.606598 |
| a (au) |
4.799850 |
| i (deg) |
17.860186 |
| Ω (om, deg) |
185.170868 |
| ω (w, deg) |
228.218375 |
| M (ma, deg) |
193.671045 |
밝기
산란 + 전체 선형
$$
M_a = (12.502 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.502 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
14:32:28.09 |
-02:10:39.1 |
HIP 71073 |
24.13 |
| 2026-05-12 12:00 |
14:32:15.09 |
-02:09:26.0 |
HIP 71073 |
22.29 |
| 2026-05-13 00:00 |
14:32:02.13 |
-02:08:13.5 |
HIP 71073 |
20.89 |
| 2026-05-13 12:00 |
14:31:49.21 |
-02:07:01.9 |
HIP 71073 |
20.00 |
| 2026-05-14 00:00 |
14:31:36.34 |
-02:05:51.0 |
HIP 71073 |
19.69 |
| 2026-05-14 12:00 |
14:31:23.51 |
-02:04:41.0 |
HIP 70929 |
16.76 |
| 2026-05-15 00:00 |
14:31:10.73 |
-02:03:31.7 |
HIP 70929 |
13.37 |
| 2026-05-15 12:00 |
14:30:58.01 |
-02:02:23.2 |
HIP 70929 |
9.99 |
| 2026-05-16 00:00 |
14:30:45.33 |
-02:01:15.5 |
HIP 70929 |
6.63 |
| 2026-05-16 12:00 |
14:30:32.71 |
-02:00:08.6 |
HIP 70929 |
3.30 |
| 2026-05-17 00:00 |
14:30:20.15 |
-01:59:02.6 |
HIP 70929 |
0.43 |
| 2026-05-17 12:00 |
14:30:07.64 |
-01:57:57.3 |
HIP 70929 |
3.39 |
| 2026-05-18 00:00 |
14:29:55.19 |
-01:56:52.9 |
HIP 70929 |
6.66 |
| 2026-05-18 12:00 |
14:29:42.80 |
-01:55:49.4 |
HIP 70929 |
9.93 |
| 2026-05-19 00:00 |
14:29:30.48 |
-01:54:46.7 |
HIP 70929 |
13.18 |
| 2026-05-19 12:00 |
14:29:18.22 |
-01:53:44.8 |
HIP 70929 |
16.41 |
| 2026-05-20 00:00 |
14:29:06.03 |
-01:52:43.8 |
HIP 70741 |
17.85 |
| 2026-05-20 12:00 |
14:28:53.91 |
-01:51:43.7 |
HIP 70741 |
14.66 |
| 2026-05-21 00:00 |
14:28:41.85 |
-01:50:44.4 |
HIP 70741 |
11.50 |
| 2026-05-21 12:00 |
14:28:29.87 |
-01:49:46.0 |
HIP 70741 |
8.38 |
| 2026-05-22 00:00 |
14:28:17.95 |
-01:48:48.5 |
HIP 70741 |
5.29 |
| 2026-05-22 12:00 |
14:28:06.12 |
-01:47:51.8 |
HIP 70741 |
2.36 |
| 2026-05-23 00:00 |
14:27:54.36 |
-01:46:56.0 |
HIP 70741 |
1.54 |
| 2026-05-23 12:00 |
14:27:42.67 |
-01:46:01.1 |
HIP 70741 |
4.25 |
| 2026-05-24 00:00 |
14:27:31.06 |
-01:45:07.1 |
HIP 70741 |
7.22 |
| 2026-05-24 12:00 |
14:27:19.54 |
-01:44:14.0 |
HIP 70741 |
10.20 |
| 2026-05-25 00:00 |
14:27:08.09 |
-01:43:21.8 |
HIP 70741 |
13.18 |
| 2026-05-25 12:00 |
14:26:56.73 |
-01:42:30.5 |
HIP 70741 |
16.14 |
| 2026-05-26 00:00 |
14:26:45.45 |
-01:41:40.1 |
HIP 70741 |
19.07 |
| 2026-05-26 12:00 |
14:26:34.25 |
-01:40:50.6 |
HIP 70741 |
21.99 |
| 2026-05-27 00:00 |
14:26:23.14 |
-01:40:02.0 |
HIP 70741 |
24.88 |
| 2026-05-27 12:00 |
14:26:12.12 |
-01:39:14.3 |
HIP 70741 |
27.74 |
| 2026-05-28 00:00 |
14:26:01.19 |
-01:38:27.5 |
HIP 70531 |
28.40 |
| 2026-05-28 12:00 |
14:25:50.35 |
-01:37:41.7 |
HIP 70531 |
27.36 |
| 2026-05-29 00:00 |
14:25:39.59 |
-01:36:56.7 |
HIP 70531 |
26.60 |
| 2026-05-29 12:00 |
14:25:28.93 |
-01:36:12.7 |
HIP 70531 |
26.13 |
| 2026-05-30 00:00 |
14:25:18.37 |
-01:35:29.6 |
HIP 70531 |
25.95 |
| 2026-05-30 12:00 |
14:25:07.90 |
-01:34:47.4 |
HIP 70531 |
26.06 |
| 2026-05-31 00:00 |
14:24:57.52 |
-01:34:06.2 |
HIP 70531 |
26.46 |
| 2026-05-31 12:00 |
14:24:47.24 |
-01:33:25.9 |
HIP 70531 |
27.12 |
| 2026-06-01 00:00 |
14:24:37.06 |
-01:32:46.5 |
HIP 70285 |
27.03 |
| 2026-06-01 12:00 |
14:24:26.98 |
-01:32:08.0 |
HIP 70285 |
24.56 |
| 2026-06-02 00:00 |
14:24:16.99 |
-01:31:30.5 |
HIP 70285 |
22.15 |