メタデータ
| 項目 |
値 |
| Designation |
175P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-22T23:00:09.181440Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:31Z |
| Obs used |
924 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
20.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-02-26.0000000 |
| e |
0.43268420 |
| q (au) |
1.949246 |
| a (au) |
3.435910 |
| i (deg) |
6.069495 |
| Ω (om, deg) |
123.690044 |
| ω (w, deg) |
55.625115 |
| M (ma, deg) |
290.057709 |
等級
散乱 + 全体線形
$$
M_a = (12.078 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.078 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
08:30:26.74 |
+21:59:44.1 |
HIP 41801 |
13.12 |
| 2026-05-12 12:00 |
08:31:10.48 |
+21:57:21.8 |
HIP 41801 |
6.08 |
| 2026-05-13 00:00 |
08:31:54.40 |
+21:54:58.1 |
HIP 41801 |
10.93 |
| 2026-05-13 12:00 |
08:32:38.50 |
+21:52:32.9 |
HIP 41801 |
20.57 |
| 2026-05-14 00:00 |
08:33:22.78 |
+21:50:06.4 |
HIP 42083 |
27.13 |
| 2026-05-14 12:00 |
08:34:07.24 |
+21:47:38.4 |
HIP 42083 |
19.52 |
| 2026-05-15 00:00 |
08:34:51.87 |
+21:45:09.1 |
HIP 42083 |
15.84 |
| 2026-05-15 12:00 |
08:35:36.68 |
+21:42:38.3 |
HIP 42083 |
18.68 |
| 2026-05-16 00:00 |
08:36:21.66 |
+21:40:06.1 |
HIP 42293 |
23.25 |
| 2026-05-16 12:00 |
08:37:06.80 |
+21:37:32.4 |
HIP 42293 |
21.52 |
| 2026-05-17 00:00 |
08:37:52.12 |
+21:34:57.4 |
HIP 42293 |
24.91 |
| 2026-05-17 12:00 |
08:38:37.60 |
+21:32:20.9 |
HIP 42293 |
31.85 |
| 2026-05-18 00:00 |
08:39:23.25 |
+21:29:43.1 |
HIP 42518 |
27.94 |
| 2026-05-18 12:00 |
08:40:09.06 |
+21:27:03.8 |
HIP 42518 |
23.30 |
| 2026-05-19 00:00 |
08:40:55.03 |
+21:24:23.1 |
HIP 42518 |
23.38 |
| 2026-05-19 12:00 |
08:41:41.16 |
+21:21:41.0 |
HIP 42806 |
23.26 |
| 2026-05-20 00:00 |
08:42:27.44 |
+21:18:57.4 |
HIP 42806 |
14.77 |
| 2026-05-20 12:00 |
08:43:13.88 |
+21:16:12.5 |
HIP 42806 |
11.93 |
| 2026-05-21 00:00 |
08:44:00.47 |
+21:13:26.2 |
HIP 42806 |
17.80 |
| 2026-05-21 12:00 |
08:44:47.21 |
+21:10:38.4 |
HIP 42806 |
27.29 |
| 2026-05-22 00:00 |
08:45:34.10 |
+21:07:49.2 |
HIP 42965 |
31.43 |
| 2026-05-22 12:00 |
08:46:21.14 |
+21:04:58.7 |
HIP 43061 |
27.98 |
| 2026-05-23 00:00 |
08:47:08.32 |
+21:02:06.7 |
HIP 43188 |
26.73 |
| 2026-05-23 12:00 |
08:47:55.64 |
+20:59:13.3 |
HIP 43232 |
18.65 |
| 2026-05-24 00:00 |
08:48:43.10 |
+20:56:18.6 |
HIP 43232 |
15.19 |
| 2026-05-24 12:00 |
08:49:30.70 |
+20:53:22.4 |
HIP 43232 |
19.42 |
| 2026-05-25 00:00 |
08:50:18.44 |
+20:50:24.8 |
HIP 43479 |
20.79 |
| 2026-05-25 12:00 |
08:51:06.32 |
+20:47:25.9 |
HIP 43479 |
17.81 |
| 2026-05-26 00:00 |
08:51:54.33 |
+20:44:25.5 |
HIP 43479 |
21.70 |
| 2026-05-26 12:00 |
08:52:42.47 |
+20:41:23.8 |
HIP 43682 |
21.81 |
| 2026-05-27 00:00 |
08:53:30.74 |
+20:38:20.6 |
HIP 43730 |
12.30 |
| 2026-05-27 12:00 |
08:54:19.14 |
+20:35:16.1 |
HIP 43730 |
0.57 |
| 2026-05-28 00:00 |
08:55:07.66 |
+20:32:10.2 |
HIP 43730 |
11.21 |
| 2026-05-28 12:00 |
08:55:56.31 |
+20:29:02.9 |
HIP 43935 |
22.24 |
| 2026-05-29 00:00 |
08:56:45.09 |
+20:25:54.2 |
HIP 43935 |
14.20 |
| 2026-05-29 12:00 |
08:57:33.99 |
+20:22:44.1 |
HIP 43935 |
13.78 |
| 2026-05-30 00:00 |
08:58:23.01 |
+20:19:32.7 |
HIP 44072 |
13.73 |
| 2026-05-30 12:00 |
08:59:12.15 |
+20:16:19.8 |
HIP 44072 |
18.36 |
| 2026-05-31 00:00 |
09:00:01.41 |
+20:13:05.6 |
HIP 44072 |
27.82 |
| 2026-05-31 12:00 |
09:00:50.78 |
+20:09:50.0 |
HIP 44072 |
38.74 |
| 2026-06-01 00:00 |
09:01:40.28 |
+20:06:33.0 |
HIP 44477 |
29.20 |
| 2026-06-01 12:00 |
09:02:29.88 |
+20:03:14.6 |
HIP 44477 |
17.43 |
| 2026-06-02 00:00 |
09:03:19.60 |
+19:59:54.9 |
HIP 44477 |
6.93 |