97P/Metcalf-Brewington
メタデータ
| 項目 |
値 |
| 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 |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (12.502 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.502 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.635 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
14:54:21.94 |
-06:46:13.3 |
HIP 72829 |
33.02 |
| 2026-02-03 12:00 |
14:54:27.72 |
-06:45:32.8 |
HIP 73007 |
34.01 |
| 2026-02-04 00:00 |
14:54:33.36 |
-06:44:51.6 |
HIP 73007 |
34.22 |
| 2026-02-04 12:00 |
14:54:38.86 |
-06:44:09.7 |
HIP 73007 |
34.52 |
| 2026-02-05 00:00 |
14:54:44.21 |
-06:43:26.9 |
HIP 73007 |
34.91 |
| 2026-02-05 12:00 |
14:54:49.43 |
-06:42:43.4 |
HIP 73007 |
35.37 |
| 2026-02-06 00:00 |
14:54:54.51 |
-06:41:59.0 |
HIP 73007 |
35.91 |
| 2026-02-06 12:00 |
14:54:59.44 |
-06:41:13.9 |
HIP 73007 |
36.52 |
| 2026-02-07 00:00 |
14:55:04.23 |
-06:40:28.0 |
HIP 73007 |
37.18 |
| 2026-02-07 12:00 |
14:55:08.88 |
-06:39:41.4 |
HIP 73169 |
37.08 |
| 2026-02-08 00:00 |
14:55:13.39 |
-06:38:53.9 |
HIP 73169 |
35.71 |
| 2026-02-08 12:00 |
14:55:17.75 |
-06:38:05.7 |
HIP 73169 |
34.37 |
| 2026-02-09 00:00 |
14:55:21.97 |
-06:37:16.8 |
HIP 73169 |
33.04 |
| 2026-02-09 12:00 |
14:55:26.04 |
-06:36:27.0 |
HIP 73169 |
31.74 |
| 2026-02-10 00:00 |
14:55:29.97 |
-06:35:36.5 |
HIP 73169 |
30.47 |
| 2026-02-10 12:00 |
14:55:33.75 |
-06:34:45.2 |
HIP 73169 |
29.21 |
| 2026-02-11 00:00 |
14:55:37.38 |
-06:33:53.1 |
HIP 73169 |
27.99 |
| 2026-02-11 12:00 |
14:55:40.87 |
-06:33:00.3 |
HIP 73169 |
26.79 |
| 2026-02-12 00:00 |
14:55:44.21 |
-06:32:06.7 |
HIP 73169 |
25.61 |
| 2026-02-12 12:00 |
14:55:47.41 |
-06:31:12.4 |
HIP 73169 |
24.47 |
| 2026-02-13 00:00 |
14:55:50.45 |
-06:30:17.3 |
HIP 73169 |
23.36 |
| 2026-02-13 12:00 |
14:55:53.35 |
-06:29:21.4 |
HIP 73169 |
22.29 |
| 2026-02-14 00:00 |
14:55:56.10 |
-06:28:24.8 |
HIP 73169 |
21.25 |
| 2026-02-14 12:00 |
14:55:58.70 |
-06:27:27.4 |
HIP 73169 |
20.26 |
| 2026-02-15 00:00 |
14:56:01.15 |
-06:26:29.3 |
HIP 73169 |
19.31 |
| 2026-02-15 12:00 |
14:56:03.45 |
-06:25:30.4 |
HIP 73169 |
18.41 |
| 2026-02-16 00:00 |
14:56:05.60 |
-06:24:30.8 |
HIP 73169 |
17.58 |
| 2026-02-16 12:00 |
14:56:07.60 |
-06:23:30.5 |
HIP 73169 |
16.81 |
| 2026-02-17 00:00 |
14:56:09.45 |
-06:22:29.4 |
HIP 73169 |
16.12 |
| 2026-02-17 12:00 |
14:56:11.15 |
-06:21:27.6 |
HIP 73169 |
15.51 |
| 2026-02-18 00:00 |
14:56:12.70 |
-06:20:25.1 |
HIP 73169 |
15.00 |
| 2026-02-18 12:00 |
14:56:14.10 |
-06:19:21.8 |
HIP 73169 |
14.59 |
| 2026-02-19 00:00 |
14:56:15.34 |
-06:18:17.9 |
HIP 73169 |
14.29 |
| 2026-02-19 12:00 |
14:56:16.44 |
-06:17:13.2 |
HIP 73169 |
14.12 |
| 2026-02-20 00:00 |
14:56:17.38 |
-06:16:07.8 |
HIP 73169 |
14.07 |
| 2026-02-20 12:00 |
14:56:18.17 |
-06:15:01.6 |
HIP 73169 |
14.15 |
| 2026-02-21 00:00 |
14:56:18.81 |
-06:13:54.8 |
HIP 73169 |
14.35 |
| 2026-02-21 12:00 |
14:56:19.30 |
-06:12:47.3 |
HIP 73169 |
14.68 |
| 2026-02-22 00:00 |
14:56:19.64 |
-06:11:39.1 |
HIP 73169 |
15.12 |
| 2026-02-22 12:00 |
14:56:19.82 |
-06:10:30.2 |
HIP 73169 |
15.67 |
| 2026-02-23 00:00 |
14:56:19.86 |
-06:09:20.6 |
HIP 73169 |
16.32 |
| 2026-02-23 12:00 |
14:56:19.74 |
-06:08:10.4 |
HIP 73169 |
17.07 |
| 2026-02-24 00:00 |
14:56:19.47 |
-06:06:59.4 |
HIP 73169 |
17.89 |