メタデータ
| 項目 |
値 |
| Designation |
28P/Neujmin 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-03-12T00:38:40.790400Z |
| Orbit solution date (soln_date, UTC) |
2026-03-09T10:05:19Z |
| Obs used |
1223 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-09-27.0000000 |
| e |
0.77347686 |
| q (au) |
1.577970 |
| a (au) |
6.966042 |
| i (deg) |
14.311570 |
| Ω (om, deg) |
346.346563 |
| ω (w, deg) |
347.441651 |
| M (ma, deg) |
331.479408 |
等級
散乱 + 全体線形
$$
M_a = (13.747 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.747 |
| n |
2.000 |
| gf |
0.893 |
| gb |
-0.726 |
| k |
0.937 |
| δ90 |
1.000 |
| 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 |
09:07:13.37 |
+24:36:47.0 |
HIP 44795 |
13.89 |
| 2026-03-26 12:00 |
09:07:07.24 |
+24:36:46.4 |
HIP 44718 |
14.48 |
| 2026-03-27 00:00 |
09:07:01.21 |
+24:36:45.3 |
HIP 44718 |
14.01 |
| 2026-03-27 12:00 |
09:06:55.27 |
+24:36:43.7 |
HIP 44718 |
13.65 |
| 2026-03-28 00:00 |
09:06:49.42 |
+24:36:41.6 |
HIP 44718 |
13.42 |
| 2026-03-28 12:00 |
09:06:43.68 |
+24:36:39.0 |
HIP 44718 |
13.30 |
| 2026-03-29 00:00 |
09:06:38.02 |
+24:36:35.9 |
HIP 44718 |
13.31 |
| 2026-03-29 12:00 |
09:06:32.47 |
+24:36:32.3 |
HIP 44718 |
13.42 |
| 2026-03-30 00:00 |
09:06:27.01 |
+24:36:28.3 |
HIP 44718 |
13.64 |
| 2026-03-30 12:00 |
09:06:21.64 |
+24:36:23.7 |
HIP 44718 |
13.95 |
| 2026-03-31 00:00 |
09:06:16.38 |
+24:36:18.7 |
HIP 44718 |
14.34 |
| 2026-03-31 12:00 |
09:06:11.21 |
+24:36:13.2 |
HIP 44718 |
14.81 |
| 2026-04-01 00:00 |
09:06:06.14 |
+24:36:07.2 |
HIP 44718 |
15.33 |
| 2026-04-01 12:00 |
09:06:01.16 |
+24:36:00.8 |
HIP 44571 |
15.84 |
| 2026-04-02 00:00 |
09:05:56.28 |
+24:35:53.8 |
HIP 44571 |
14.73 |
| 2026-04-02 12:00 |
09:05:51.51 |
+24:35:46.4 |
HIP 44571 |
13.65 |
| 2026-04-03 00:00 |
09:05:46.83 |
+24:35:38.5 |
HIP 44571 |
12.60 |
| 2026-04-03 12:00 |
09:05:42.24 |
+24:35:30.2 |
HIP 44571 |
11.57 |
| 2026-04-04 00:00 |
09:05:37.76 |
+24:35:21.4 |
HIP 44571 |
10.56 |
| 2026-04-04 12:00 |
09:05:33.38 |
+24:35:12.1 |
HIP 44571 |
9.59 |
| 2026-04-05 00:00 |
09:05:29.09 |
+24:35:02.3 |
HIP 44571 |
8.64 |
| 2026-04-05 12:00 |
09:05:24.91 |
+24:34:52.1 |
HIP 44571 |
7.73 |
| 2026-04-06 00:00 |
09:05:20.82 |
+24:34:41.4 |
HIP 44571 |
6.86 |
| 2026-04-06 12:00 |
09:05:16.84 |
+24:34:30.2 |
HIP 44571 |
6.04 |
| 2026-04-07 00:00 |
09:05:12.95 |
+24:34:18.6 |
HIP 44571 |
5.27 |
| 2026-04-07 12:00 |
09:05:09.17 |
+24:34:06.6 |
HIP 44571 |
4.58 |
| 2026-04-08 00:00 |
09:05:05.48 |
+24:33:54.0 |
HIP 44571 |
3.99 |
| 2026-04-08 12:00 |
09:05:01.90 |
+24:33:41.1 |
HIP 44571 |
3.54 |
| 2026-04-09 00:00 |
09:04:58.42 |
+24:33:27.6 |
HIP 44571 |
3.26 |
| 2026-04-09 12:00 |
09:04:55.04 |
+24:33:13.8 |
HIP 44571 |
3.19 |
| 2026-04-10 00:00 |
09:04:51.76 |
+24:32:59.4 |
HIP 44571 |
3.32 |
| 2026-04-10 12:00 |
09:04:48.58 |
+24:32:44.6 |
HIP 44571 |
3.63 |
| 2026-04-11 00:00 |
09:04:45.50 |
+24:32:29.4 |
HIP 44571 |
4.06 |
| 2026-04-11 12:00 |
09:04:42.53 |
+24:32:13.7 |
HIP 44571 |
4.56 |
| 2026-04-12 00:00 |
09:04:39.65 |
+24:31:57.6 |
HIP 44571 |
5.12 |
| 2026-04-12 12:00 |
09:04:36.88 |
+24:31:41.1 |
HIP 44571 |
5.70 |
| 2026-04-13 00:00 |
09:04:34.21 |
+24:31:24.1 |
HIP 44571 |
6.29 |
| 2026-04-13 12:00 |
09:04:31.64 |
+24:31:06.6 |
HIP 44571 |
6.89 |
| 2026-04-14 00:00 |
09:04:29.18 |
+24:30:48.7 |
HIP 44571 |
7.48 |
| 2026-04-14 12:00 |
09:04:26.81 |
+24:30:30.4 |
HIP 44571 |
8.07 |
| 2026-04-15 00:00 |
09:04:24.55 |
+24:30:11.7 |
HIP 44571 |
8.66 |
| 2026-04-15 12:00 |
09:04:22.39 |
+24:29:52.5 |
HIP 44571 |
9.23 |
| 2026-04-16 00:00 |
09:04:20.33 |
+24:29:32.9 |
HIP 44571 |
9.80 |