メタデータ
| 項目 |
値 |
| Designation |
123P/West-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-02-04T19:43:40.108800Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T14:13:17Z |
| Obs used |
3531 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
18.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-11-27.0000000 |
| e |
0.44912926 |
| q (au) |
2.126481 |
| a (au) |
3.860217 |
| i (deg) |
15.358149 |
| Ω (om, deg) |
46.505344 |
| ω (w, deg) |
102.969878 |
| M (ma, deg) |
256.060691 |
等級
散乱 + 全体線形
$$
M_a = (9.330 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.330 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.681 |
| k |
0.994 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:18:16.71 |
+31:01:01.1 |
HIP 20178 |
17.75 |
| 2026-03-26 12:00 |
04:19:04.18 |
+31:02:59.4 |
HIP 20178 |
11.48 |
| 2026-03-27 00:00 |
04:19:51.89 |
+31:04:57.4 |
HIP 20227 |
4.67 |
| 2026-03-27 12:00 |
04:20:39.84 |
+31:06:55.2 |
HIP 20227 |
7.35 |
| 2026-03-28 00:00 |
04:21:28.03 |
+31:08:52.7 |
HIP 20286 |
9.53 |
| 2026-03-28 12:00 |
04:22:16.47 |
+31:10:49.9 |
HIP 20286 |
18.30 |
| 2026-03-29 00:00 |
04:23:05.15 |
+31:12:46.8 |
HIP 20621 |
26.01 |
| 2026-03-29 12:00 |
04:23:54.06 |
+31:14:43.3 |
HIP 20621 |
15.56 |
| 2026-03-30 00:00 |
04:24:43.21 |
+31:16:39.5 |
HIP 20621 |
5.80 |
| 2026-03-30 12:00 |
04:25:32.60 |
+31:18:35.4 |
HIP 20621 |
7.33 |
| 2026-03-31 00:00 |
04:26:22.22 |
+31:20:30.8 |
HIP 20704 |
6.76 |
| 2026-03-31 12:00 |
04:27:12.07 |
+31:22:25.9 |
HIP 20704 |
14.58 |
| 2026-04-01 00:00 |
04:28:02.16 |
+31:24:20.5 |
HIP 20704 |
24.81 |
| 2026-04-01 12:00 |
04:28:52.48 |
+31:26:14.7 |
HIP 21105 |
33.55 |
| 2026-04-02 00:00 |
04:29:43.03 |
+31:28:08.5 |
HIP 21105 |
24.24 |
| 2026-04-02 12:00 |
04:30:33.81 |
+31:30:01.9 |
HIP 21105 |
16.99 |
| 2026-04-03 00:00 |
04:31:24.81 |
+31:31:54.7 |
HIP 21105 |
15.22 |
| 2026-04-03 12:00 |
04:32:16.05 |
+31:33:47.1 |
HIP 21196 |
10.86 |
| 2026-04-04 00:00 |
04:33:07.51 |
+31:35:39.0 |
HIP 21196 |
12.69 |
| 2026-04-04 12:00 |
04:33:59.20 |
+31:37:30.4 |
HIP 21196 |
21.29 |
| 2026-04-05 00:00 |
04:34:51.11 |
+31:39:21.2 |
HIP 21283 |
29.26 |
| 2026-04-05 12:00 |
04:35:43.24 |
+31:41:11.5 |
HIP 21283 |
36.38 |
| 2026-04-06 00:00 |
04:36:35.60 |
+31:43:01.3 |
HIP 21602 |
27.08 |
| 2026-04-06 12:00 |
04:37:28.18 |
+31:44:50.5 |
HIP 21602 |
18.09 |
| 2026-04-07 00:00 |
04:38:20.99 |
+31:46:39.1 |
HIP 21679 |
11.56 |
| 2026-04-07 12:00 |
04:39:14.01 |
+31:48:27.1 |
HIP 21679 |
3.96 |
| 2026-04-08 00:00 |
04:40:07.25 |
+31:50:14.5 |
HIP 21726 |
11.54 |
| 2026-04-08 12:00 |
04:41:00.71 |
+31:52:01.2 |
HIP 21726 |
17.02 |
| 2026-04-09 00:00 |
04:41:54.39 |
+31:53:47.3 |
HIP 21726 |
26.69 |
| 2026-04-09 12:00 |
04:42:48.28 |
+31:55:32.8 |
HIP 21726 |
37.46 |
| 2026-04-10 00:00 |
04:43:42.39 |
+31:57:17.6 |
HIP 22133 |
40.18 |
| 2026-04-10 12:00 |
04:44:36.72 |
+31:59:01.7 |
HIP 22133 |
32.23 |
| 2026-04-11 00:00 |
04:45:31.26 |
+32:00:45.1 |
HIP 22133 |
27.09 |
| 2026-04-11 12:00 |
04:46:26.01 |
+32:02:27.8 |
HIP 22133 |
26.49 |
| 2026-04-12 00:00 |
04:47:20.98 |
+32:04:09.8 |
HIP 22241 |
29.00 |
| 2026-04-12 12:00 |
04:48:16.15 |
+32:05:51.0 |
HIP 22407 |
32.30 |
| 2026-04-13 00:00 |
04:49:11.54 |
+32:07:31.5 |
HIP 22407 |
27.82 |
| 2026-04-13 12:00 |
04:50:07.13 |
+32:09:11.2 |
HIP 22603 |
23.00 |
| 2026-04-14 00:00 |
04:51:02.94 |
+32:10:50.1 |
HIP 22603 |
11.83 |
| 2026-04-14 12:00 |
04:51:58.95 |
+32:12:28.2 |
HIP 22603 |
5.93 |
| 2026-04-15 00:00 |
04:52:55.17 |
+32:14:05.5 |
HIP 22603 |
14.75 |
| 2026-04-15 12:00 |
04:53:51.59 |
+32:15:42.0 |
HIP 22789 |
5.04 |
| 2026-04-16 00:00 |
04:54:48.22 |
+32:17:17.6 |
HIP 22789 |
9.20 |