メタデータ
| 項目 |
値 |
| Designation |
395P/Catalina-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-30T11:54:17.147520Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:01:13Z |
| Obs used |
810 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-03-31.0000000 |
| e |
0.38213832 |
| q (au) |
4.064893 |
| a (au) |
6.578970 |
| i (deg) |
3.276962 |
| Ω (om, deg) |
223.549119 |
| ω (w, deg) |
89.966129 |
| M (ma, deg) |
5.286093 |
等級
散乱 + 全体線形
$$
M_a = (8.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.762 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2020-04-26 |
2021-11-28 |
+16.3019 |
-9.562 |
| 2022-06-06 |
2023-10-18 |
+22.4213 |
-14.528 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
05:26:52.39 |
+20:55:55.9 |
HIP 25385 |
18.58 |
| 2026-05-12 12:00 |
05:27:09.38 |
+20:56:10.7 |
HIP 25385 |
21.62 |
| 2026-05-13 00:00 |
05:27:26.41 |
+20:56:25.3 |
HIP 25385 |
24.93 |
| 2026-05-13 12:00 |
05:27:43.49 |
+20:56:39.8 |
HIP 25385 |
28.43 |
| 2026-05-14 00:00 |
05:28:00.61 |
+20:56:54.2 |
HIP 25694 |
28.14 |
| 2026-05-14 12:00 |
05:28:17.77 |
+20:57:08.5 |
HIP 25694 |
25.65 |
| 2026-05-15 00:00 |
05:28:34.97 |
+20:57:22.6 |
HIP 25694 |
23.57 |
| 2026-05-15 12:00 |
05:28:52.21 |
+20:57:36.5 |
HIP 25694 |
22.03 |
| 2026-05-16 00:00 |
05:29:09.49 |
+20:57:50.3 |
HIP 25694 |
21.17 |
| 2026-05-16 12:00 |
05:29:26.81 |
+20:58:04.0 |
HIP 25694 |
21.05 |
| 2026-05-17 00:00 |
05:29:44.17 |
+20:58:17.5 |
HIP 25694 |
21.71 |
| 2026-05-17 12:00 |
05:30:01.56 |
+20:58:30.9 |
HIP 25694 |
23.08 |
| 2026-05-18 00:00 |
05:30:19.00 |
+20:58:44.2 |
HIP 25694 |
25.05 |
| 2026-05-18 12:00 |
05:30:36.46 |
+20:58:57.3 |
HIP 25936 |
21.37 |
| 2026-05-19 00:00 |
05:30:53.96 |
+20:59:10.2 |
HIP 25936 |
17.35 |
| 2026-05-19 12:00 |
05:31:11.50 |
+20:59:23.0 |
HIP 25936 |
13.35 |
| 2026-05-20 00:00 |
05:31:29.07 |
+20:59:35.6 |
HIP 25936 |
9.44 |
| 2026-05-20 12:00 |
05:31:46.67 |
+20:59:48.1 |
HIP 25936 |
5.80 |
| 2026-05-21 00:00 |
05:32:04.31 |
+21:00:00.4 |
HIP 25936 |
3.46 |
| 2026-05-21 12:00 |
05:32:21.97 |
+21:00:12.6 |
HIP 25936 |
4.93 |
| 2026-05-22 00:00 |
05:32:39.67 |
+21:00:24.6 |
HIP 25936 |
8.42 |
| 2026-05-22 12:00 |
05:32:57.39 |
+21:00:36.5 |
HIP 25936 |
12.32 |
| 2026-05-23 00:00 |
05:33:15.15 |
+21:00:48.1 |
HIP 25936 |
16.35 |
| 2026-05-23 12:00 |
05:33:32.93 |
+21:00:59.7 |
HIP 25936 |
20.43 |
| 2026-05-24 00:00 |
05:33:50.74 |
+21:01:11.1 |
HIP 25936 |
24.54 |
| 2026-05-24 12:00 |
05:34:08.58 |
+21:01:22.3 |
HIP 26250 |
24.63 |
| 2026-05-25 00:00 |
05:34:26.45 |
+21:01:33.3 |
HIP 26250 |
21.55 |
| 2026-05-25 12:00 |
05:34:44.34 |
+21:01:44.2 |
HIP 26250 |
18.88 |
| 2026-05-26 00:00 |
05:35:02.26 |
+21:01:54.9 |
HIP 26250 |
16.84 |
| 2026-05-26 12:00 |
05:35:20.20 |
+21:02:05.5 |
HIP 26250 |
15.67 |
| 2026-05-27 00:00 |
05:35:38.16 |
+21:02:15.9 |
HIP 26250 |
15.59 |
| 2026-05-27 12:00 |
05:35:56.15 |
+21:02:26.1 |
HIP 26250 |
16.60 |
| 2026-05-28 00:00 |
05:36:14.16 |
+21:02:36.1 |
HIP 26250 |
18.54 |
| 2026-05-28 12:00 |
05:36:32.20 |
+21:02:46.0 |
HIP 26451 |
16.55 |
| 2026-05-29 00:00 |
05:36:50.25 |
+21:02:55.7 |
HIP 26451 |
12.62 |
| 2026-05-29 12:00 |
05:37:08.33 |
+21:03:05.3 |
HIP 26451 |
8.95 |
| 2026-05-30 00:00 |
05:37:26.43 |
+21:03:14.7 |
HIP 26451 |
6.03 |
| 2026-05-30 12:00 |
05:37:44.54 |
+21:03:23.9 |
HIP 26451 |
5.34 |
| 2026-05-31 00:00 |
05:38:02.68 |
+21:03:32.9 |
HIP 26451 |
7.51 |
| 2026-05-31 12:00 |
05:38:20.83 |
+21:03:41.7 |
HIP 26451 |
10.97 |
| 2026-06-01 00:00 |
05:38:39.01 |
+21:03:50.4 |
HIP 26451 |
14.84 |
| 2026-06-01 12:00 |
05:38:57.20 |
+21:03:58.9 |
HIP 26451 |
18.87 |
| 2026-06-02 00:00 |
05:39:15.41 |
+21:04:07.3 |
HIP 26684 |
18.89 |