175P/Hergenrother
メタデータ
| 項目 |
値 |
| Designation |
175P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-24T01:38:51.325440Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:54Z |
| Obs used |
855 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
21.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-12-12.0000000 |
| e |
0.42490718 |
| q (au) |
2.002139 |
| a (au) |
3.481419 |
| i (deg) |
6.079508 |
| Ω (om, deg) |
126.077245 |
| ω (w, deg) |
51.649941 |
| M (ma, deg) |
224.343508 |
等級
散乱 + 全体線形
$$
M_a = (16.411 + 5.960\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.411 |
| n |
5.960 |
| gf |
0.897 |
| gb |
-0.881 |
| k |
0.929 |
| δ90 |
8.360 |
| 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 |
07:49:08.69 |
+22:40:53.0 |
HIP 38247 |
13.74 |
| 2026-02-03 12:00 |
07:48:45.50 |
+22:42:44.2 |
HIP 38247 |
18.79 |
| 2026-02-04 00:00 |
07:48:22.50 |
+22:44:34.4 |
HIP 38106 |
24.02 |
| 2026-02-04 12:00 |
07:47:59.71 |
+22:46:23.5 |
HIP 38106 |
23.41 |
| 2026-02-05 00:00 |
07:47:37.14 |
+22:48:11.6 |
HIP 38019 |
21.06 |
| 2026-02-05 12:00 |
07:47:14.78 |
+22:49:58.7 |
HIP 38019 |
19.60 |
| 2026-02-06 00:00 |
07:46:52.66 |
+22:51:44.7 |
HIP 38019 |
19.59 |
| 2026-02-06 12:00 |
07:46:30.77 |
+22:53:29.6 |
HIP 38019 |
20.99 |
| 2026-02-07 00:00 |
07:46:09.13 |
+22:55:13.4 |
HIP 37799 |
16.58 |
| 2026-02-07 12:00 |
07:45:47.73 |
+22:56:56.1 |
HIP 37799 |
11.37 |
| 2026-02-08 00:00 |
07:45:26.60 |
+22:58:37.6 |
HIP 37799 |
6.23 |
| 2026-02-08 12:00 |
07:45:05.72 |
+23:00:18.0 |
HIP 37799 |
1.24 |
| 2026-02-09 00:00 |
07:44:45.12 |
+23:01:57.3 |
HIP 37799 |
3.93 |
| 2026-02-09 12:00 |
07:44:24.80 |
+23:03:35.3 |
HIP 37799 |
8.87 |
| 2026-02-10 00:00 |
07:44:04.76 |
+23:05:12.2 |
HIP 37799 |
13.74 |
| 2026-02-10 12:00 |
07:43:45.01 |
+23:06:47.9 |
HIP 37747 |
17.62 |
| 2026-02-11 00:00 |
07:43:25.57 |
+23:08:22.4 |
HIP 37747 |
19.63 |
| 2026-02-11 12:00 |
07:43:06.42 |
+23:09:55.7 |
HIP 37522 |
20.02 |
| 2026-02-12 00:00 |
07:42:47.59 |
+23:11:27.8 |
HIP 37479 |
17.29 |
| 2026-02-12 12:00 |
07:42:29.07 |
+23:12:58.6 |
HIP 37479 |
14.12 |
| 2026-02-13 00:00 |
07:42:10.87 |
+23:14:28.1 |
HIP 37479 |
11.90 |
| 2026-02-13 12:00 |
07:41:53.01 |
+23:15:56.5 |
HIP 37479 |
11.11 |
| 2026-02-14 00:00 |
07:41:35.48 |
+23:17:23.5 |
HIP 37400 |
11.81 |
| 2026-02-14 12:00 |
07:41:18.28 |
+23:18:49.3 |
HIP 37400 |
8.58 |
| 2026-02-15 00:00 |
07:41:01.44 |
+23:20:13.7 |
HIP 37400 |
6.58 |
| 2026-02-15 12:00 |
07:40:44.95 |
+23:21:36.9 |
HIP 37400 |
6.83 |
| 2026-02-16 00:00 |
07:40:28.81 |
+23:22:58.8 |
HIP 37400 |
9.02 |
| 2026-02-16 12:00 |
07:40:13.03 |
+23:24:19.4 |
HIP 37400 |
12.07 |
| 2026-02-17 00:00 |
07:39:57.63 |
+23:25:38.7 |
HIP 37400 |
15.41 |
| 2026-02-17 12:00 |
07:39:42.59 |
+23:26:56.7 |
HIP 37400 |
18.84 |
| 2026-02-18 00:00 |
07:39:27.93 |
+23:28:13.3 |
HIP 37400 |
22.26 |
| 2026-02-18 12:00 |
07:39:13.66 |
+23:29:28.6 |
HIP 37210 |
20.26 |
| 2026-02-19 00:00 |
07:38:59.77 |
+23:30:42.6 |
HIP 37210 |
17.99 |
| 2026-02-19 12:00 |
07:38:46.27 |
+23:31:55.3 |
HIP 37210 |
16.16 |
| 2026-02-20 00:00 |
07:38:33.16 |
+23:33:06.6 |
HIP 37210 |
14.88 |
| 2026-02-20 12:00 |
07:38:20.45 |
+23:34:16.6 |
HIP 37210 |
14.22 |
| 2026-02-21 00:00 |
07:38:08.15 |
+23:35:25.2 |
HIP 37210 |
14.22 |
| 2026-02-21 12:00 |
07:37:56.25 |
+23:36:32.5 |
HIP 37144 |
13.63 |
| 2026-02-22 00:00 |
07:37:44.76 |
+23:37:38.4 |
HIP 37144 |
12.84 |
| 2026-02-22 12:00 |
07:37:33.68 |
+23:38:43.0 |
HIP 37144 |
12.63 |
| 2026-02-23 00:00 |
07:37:23.02 |
+23:39:46.2 |
HIP 37144 |
12.98 |
| 2026-02-23 12:00 |
07:37:12.77 |
+23:40:48.1 |
HIP 37144 |
13.78 |
| 2026-02-24 00:00 |
07:37:02.95 |
+23:41:48.6 |
HIP 37144 |
14.91 |