メタデータ
| 項目 |
値 |
| Designation |
42P/Neujmin 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-07-16T05:22:50.543040Z |
| Orbit solution date (soln_date, UTC) |
2025-05-16T08:56:55Z |
| Obs used |
262 |
| NEO |
- |
| M1 |
16.600 |
| 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) |
2007-01-20.0000000 |
| e |
0.58562308 |
| q (au) |
2.013138 |
| a (au) |
4.858229 |
| i (deg) |
3.985667 |
| Ω (om, deg) |
150.351892 |
| ω (w, deg) |
147.175572 |
| M (ma, deg) |
84.474127 |
等級
散乱 + 全体線形
$$
M_a = (17.715 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.715 |
| n |
6.000 |
| gf |
0.915 |
| gb |
-0.848 |
| k |
0.839 |
| δ90 |
5.975 |
| 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) |
| 2026-05-12 00:00 |
00:11:02.52 |
+00:23:06.8 |
HIP 766 |
30.86 |
| 2026-05-12 12:00 |
00:11:54.37 |
+00:28:02.6 |
HIP 1087 |
33.45 |
| 2026-05-13 00:00 |
00:12:46.08 |
+00:32:57.2 |
HIP 1087 |
21.29 |
| 2026-05-13 12:00 |
00:13:37.64 |
+00:37:50.9 |
HIP 1087 |
13.04 |
| 2026-05-14 00:00 |
00:14:29.07 |
+00:42:43.4 |
HIP 1121 |
11.69 |
| 2026-05-14 12:00 |
00:15:20.36 |
+00:47:34.9 |
HIP 1121 |
20.28 |
| 2026-05-15 00:00 |
00:16:11.50 |
+00:52:25.3 |
HIP 1385 |
24.11 |
| 2026-05-15 12:00 |
00:17:02.50 |
+00:57:14.6 |
HIP 1385 |
22.26 |
| 2026-05-16 00:00 |
00:17:53.36 |
+01:02:02.8 |
HIP 1512 |
14.53 |
| 2026-05-16 12:00 |
00:18:44.08 |
+01:06:49.9 |
HIP 1512 |
3.51 |
| 2026-05-17 00:00 |
00:19:34.65 |
+01:11:35.8 |
HIP 1601 |
7.30 |
| 2026-05-17 12:00 |
00:20:25.08 |
+01:16:20.6 |
HIP 1601 |
8.52 |
| 2026-05-18 00:00 |
00:21:15.36 |
+01:21:04.3 |
HIP 1601 |
21.28 |
| 2026-05-18 12:00 |
00:22:05.49 |
+01:25:46.8 |
HIP 1783 |
25.22 |
| 2026-05-19 00:00 |
00:22:55.48 |
+01:30:28.2 |
HIP 1783 |
19.30 |
| 2026-05-19 12:00 |
00:23:45.32 |
+01:35:08.3 |
HIP 1924 |
8.19 |
| 2026-05-20 00:00 |
00:24:35.01 |
+01:39:47.3 |
HIP 1924 |
7.78 |
| 2026-05-20 12:00 |
00:25:24.55 |
+01:44:25.1 |
HIP 2006 |
11.96 |
| 2026-05-21 00:00 |
00:26:13.94 |
+01:49:01.7 |
HIP 2047 |
8.99 |
| 2026-05-21 12:00 |
00:27:03.19 |
+01:53:37.1 |
HIP 2212 |
16.62 |
| 2026-05-22 00:00 |
00:27:52.28 |
+01:58:11.3 |
HIP 2212 |
5.20 |
| 2026-05-22 12:00 |
00:28:41.23 |
+02:02:44.3 |
HIP 2212 |
10.95 |
| 2026-05-23 00:00 |
00:29:30.02 |
+02:07:16.1 |
HIP 2331 |
22.19 |
| 2026-05-23 12:00 |
00:30:18.66 |
+02:11:46.6 |
HIP 2331 |
18.66 |
| 2026-05-24 00:00 |
00:31:07.15 |
+02:16:15.9 |
HIP 2458 |
18.49 |
| 2026-05-24 12:00 |
00:31:55.49 |
+02:20:44.0 |
HIP 2458 |
24.96 |
| 2026-05-25 00:00 |
00:32:43.68 |
+02:25:10.8 |
HIP 2703 |
24.78 |
| 2026-05-25 12:00 |
00:33:31.71 |
+02:29:36.3 |
HIP 2703 |
12.91 |
| 2026-05-26 00:00 |
00:34:19.59 |
+02:34:00.6 |
HIP 2703 |
6.82 |
| 2026-05-26 12:00 |
00:35:07.32 |
+02:38:23.6 |
HIP 2703 |
15.80 |
| 2026-05-27 00:00 |
00:35:54.89 |
+02:42:45.4 |
HIP 2703 |
27.80 |
| 2026-05-27 12:00 |
00:36:42.30 |
+02:47:05.8 |
HIP 2988 |
19.58 |
| 2026-05-28 00:00 |
00:37:29.56 |
+02:51:25.0 |
HIP 2988 |
9.55 |
| 2026-05-28 12:00 |
00:38:16.67 |
+02:55:42.9 |
HIP 2988 |
10.68 |
| 2026-05-29 00:00 |
00:39:03.62 |
+02:59:59.5 |
HIP 3086 |
8.32 |
| 2026-05-29 12:00 |
00:39:50.41 |
+03:04:14.8 |
HIP 3086 |
10.11 |
| 2026-05-30 00:00 |
00:40:37.04 |
+03:08:28.8 |
HIP 3086 |
21.03 |
| 2026-05-30 12:00 |
00:41:23.52 |
+03:12:41.4 |
HIP 3276 |
26.48 |
| 2026-05-31 00:00 |
00:42:09.84 |
+03:16:52.8 |
HIP 3276 |
22.48 |
| 2026-05-31 12:00 |
00:42:55.99 |
+03:21:02.8 |
HIP 3276 |
24.72 |
| 2026-06-01 00:00 |
00:43:41.99 |
+03:25:11.4 |
HIP 3518 |
22.51 |
| 2026-06-01 12:00 |
00:44:27.83 |
+03:29:18.8 |
HIP 3518 |
18.56 |
| 2026-06-02 00:00 |
00:45:13.50 |
+03:33:24.8 |
HIP 3518 |
21.83 |