メタデータ
| 項目 |
値 |
| Designation |
37P/Forbes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-04T04:20:40.490880Z |
| Orbit solution date (soln_date, UTC) |
2025-11-23T22:22:59Z |
| Obs used |
1737 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
21.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-07-09.0000000 |
| e |
0.53418886 |
| q (au) |
1.610684 |
| a (au) |
3.457805 |
| i (deg) |
8.956078 |
| Ω (om, deg) |
314.577863 |
| ω (w, deg) |
330.024671 |
| M (ma, deg) |
66.038643 |
等級
散乱 + 全体線形
$$
M_a = (10.398 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.398 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-02-05 |
2024-10-07 |
+32.4582 |
-8.642 |
| 2024-10-07 |
2024-04-20 |
-1.5202 |
+0.726 |
| 2024-04-20 |
2025-01-05 |
+15.9337 |
-5.687 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:57:13.69 |
+31:06:54.2 |
HIP 28324 |
23.93 |
| 2026-09-20 12:00 |
05:57:23.24 |
+31:07:31.5 |
HIP 28324 |
22.09 |
| 2026-09-21 00:00 |
05:57:32.57 |
+31:08:08.9 |
HIP 28324 |
20.35 |
| 2026-09-21 12:00 |
05:57:41.67 |
+31:08:46.3 |
HIP 28324 |
18.73 |
| 2026-09-22 00:00 |
05:57:50.54 |
+31:09:23.9 |
HIP 28324 |
17.25 |
| 2026-09-22 12:00 |
05:57:59.19 |
+31:10:01.4 |
HIP 28324 |
15.92 |
| 2026-09-23 00:00 |
05:58:07.61 |
+31:10:39.1 |
HIP 28324 |
14.77 |
| 2026-09-23 12:00 |
05:58:15.81 |
+31:11:16.8 |
HIP 28324 |
13.83 |
| 2026-09-24 00:00 |
05:58:23.77 |
+31:11:54.6 |
HIP 28324 |
13.12 |
| 2026-09-24 12:00 |
05:58:31.50 |
+31:12:32.4 |
HIP 28324 |
12.66 |
| 2026-09-25 00:00 |
05:58:39.00 |
+31:13:10.3 |
HIP 28324 |
12.46 |
| 2026-09-25 12:00 |
05:58:46.27 |
+31:13:48.2 |
HIP 28324 |
12.51 |
| 2026-09-26 00:00 |
05:58:53.30 |
+31:14:26.2 |
HIP 28324 |
12.79 |
| 2026-09-26 12:00 |
05:59:00.10 |
+31:15:04.3 |
HIP 28324 |
13.27 |
| 2026-09-27 00:00 |
05:59:06.66 |
+31:15:42.4 |
HIP 28324 |
13.92 |
| 2026-09-27 12:00 |
05:59:12.99 |
+31:16:20.6 |
HIP 28324 |
14.69 |
| 2026-09-28 00:00 |
05:59:19.07 |
+31:16:58.8 |
HIP 28324 |
15.56 |
| 2026-09-28 12:00 |
05:59:24.92 |
+31:17:37.1 |
HIP 28445 |
14.59 |
| 2026-09-29 00:00 |
05:59:30.53 |
+31:18:15.5 |
HIP 28445 |
13.24 |
| 2026-09-29 12:00 |
05:59:35.90 |
+31:18:53.8 |
HIP 28445 |
11.94 |
| 2026-09-30 00:00 |
05:59:41.02 |
+31:19:32.3 |
HIP 28445 |
10.68 |
| 2026-09-30 12:00 |
05:59:45.90 |
+31:20:10.7 |
HIP 28445 |
9.46 |
| 2026-10-01 00:00 |
05:59:50.54 |
+31:20:49.3 |
HIP 28445 |
8.28 |
| 2026-10-01 12:00 |
05:59:54.93 |
+31:21:27.8 |
HIP 28445 |
7.15 |
| 2026-10-02 00:00 |
05:59:59.07 |
+31:22:06.4 |
HIP 28445 |
6.05 |
| 2026-10-02 12:00 |
06:00:02.97 |
+31:22:45.1 |
HIP 28445 |
5.00 |
| 2026-10-03 00:00 |
06:00:06.61 |
+31:23:23.7 |
HIP 28445 |
3.99 |
| 2026-10-03 12:00 |
06:00:10.01 |
+31:24:02.4 |
HIP 28445 |
3.02 |
| 2026-10-04 00:00 |
06:00:13.15 |
+31:24:41.2 |
HIP 28445 |
2.10 |
| 2026-10-04 12:00 |
06:00:16.05 |
+31:25:19.9 |
HIP 28445 |
1.25 |
| 2026-10-05 00:00 |
06:00:18.68 |
+31:25:58.7 |
HIP 28445 |
0.59 |
| 2026-10-05 12:00 |
06:00:21.07 |
+31:26:37.5 |
HIP 28445 |
0.78 |
| 2026-10-06 00:00 |
06:00:23.19 |
+31:27:16.3 |
HIP 28445 |
1.48 |
| 2026-10-06 12:00 |
06:00:25.07 |
+31:27:55.1 |
HIP 28445 |
2.22 |
| 2026-10-07 00:00 |
06:00:26.68 |
+31:28:34.0 |
HIP 28445 |
2.94 |
| 2026-10-07 12:00 |
06:00:28.03 |
+31:29:12.8 |
HIP 28445 |
3.65 |
| 2026-10-08 00:00 |
06:00:29.13 |
+31:29:51.7 |
HIP 28445 |
4.34 |
| 2026-10-08 12:00 |
06:00:29.97 |
+31:30:30.5 |
HIP 28445 |
5.01 |
| 2026-10-09 00:00 |
06:00:30.54 |
+31:31:09.4 |
HIP 28445 |
5.66 |
| 2026-10-09 12:00 |
06:00:30.85 |
+31:31:48.2 |
HIP 28445 |
6.29 |
| 2026-10-10 00:00 |
06:00:30.90 |
+31:32:27.0 |
HIP 28445 |
6.91 |
| 2026-10-10 12:00 |
06:00:30.69 |
+31:33:05.8 |
HIP 28445 |
7.52 |
| 2026-10-11 00:00 |
06:00:30.22 |
+31:33:44.5 |
HIP 28445 |
8.12 |