メタデータ
| 項目 |
値 |
| Designation |
P/2015 W2 (Catalina) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-30T21:23:50.429760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:17Z |
| Obs used |
188 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
21.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-05.0000000 |
| e |
0.63410542 |
| q (au) |
2.678336 |
| a (au) |
7.319966 |
| i (deg) |
11.611215 |
| Ω (om, deg) |
294.247294 |
| ω (w, deg) |
117.626508 |
| M (ma, deg) |
3.240245 |
等級
散乱 + 全体線形
$$
M_a = (18.559 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.559 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-0.724 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:19:55.29 |
-29:27:26.5 |
HIP 74949 |
19.21 |
| 2026-06-01 12:00 |
15:19:46.12 |
-29:26:43.4 |
HIP 74949 |
17.36 |
| 2026-06-02 00:00 |
15:19:37.00 |
-29:26:00.1 |
HIP 74949 |
15.58 |
| 2026-06-02 12:00 |
15:19:27.91 |
-29:25:16.6 |
HIP 74949 |
13.90 |
| 2026-06-03 00:00 |
15:19:18.86 |
-29:24:33.0 |
HIP 74949 |
12.35 |
| 2026-06-03 12:00 |
15:19:09.85 |
-29:23:49.3 |
HIP 74949 |
10.98 |
| 2026-06-04 00:00 |
15:19:00.88 |
-29:23:05.4 |
HIP 74949 |
9.87 |
| 2026-06-04 12:00 |
15:18:51.95 |
-29:22:21.3 |
HIP 74949 |
9.11 |
| 2026-06-05 00:00 |
15:18:43.06 |
-29:21:37.1 |
HIP 74949 |
8.78 |
| 2026-06-05 12:00 |
15:18:34.22 |
-29:20:52.8 |
HIP 74949 |
8.93 |
| 2026-06-06 00:00 |
15:18:25.42 |
-29:20:08.4 |
HIP 74949 |
9.52 |
| 2026-06-06 12:00 |
15:18:16.66 |
-29:19:23.8 |
HIP 74949 |
10.49 |
| 2026-06-07 00:00 |
15:18:07.95 |
-29:18:39.1 |
HIP 74949 |
11.72 |
| 2026-06-07 12:00 |
15:17:59.29 |
-29:17:54.3 |
HIP 74949 |
13.15 |
| 2026-06-08 00:00 |
15:17:50.67 |
-29:17:09.4 |
HIP 74949 |
14.71 |
| 2026-06-08 12:00 |
15:17:42.10 |
-29:16:24.4 |
HIP 74949 |
16.36 |
| 2026-06-09 00:00 |
15:17:33.58 |
-29:15:39.3 |
HIP 74949 |
18.07 |
| 2026-06-09 12:00 |
15:17:25.11 |
-29:14:54.1 |
HIP 74949 |
19.83 |
| 2026-06-10 00:00 |
15:17:16.69 |
-29:14:08.8 |
HIP 74949 |
21.62 |
| 2026-06-10 12:00 |
15:17:08.33 |
-29:13:23.5 |
HIP 74949 |
23.43 |
| 2026-06-11 00:00 |
15:17:00.01 |
-29:12:38.0 |
HIP 74721 |
24.96 |
| 2026-06-11 12:00 |
15:16:51.75 |
-29:11:52.5 |
HIP 74721 |
24.98 |
| 2026-06-12 00:00 |
15:16:43.55 |
-29:11:06.9 |
HIP 74721 |
25.16 |
| 2026-06-12 12:00 |
15:16:35.40 |
-29:10:21.2 |
HIP 74721 |
25.48 |
| 2026-06-13 00:00 |
15:16:27.30 |
-29:09:35.5 |
HIP 74612 |
23.60 |
| 2026-06-13 12:00 |
15:16:19.27 |
-29:08:49.8 |
HIP 74612 |
21.73 |
| 2026-06-14 00:00 |
15:16:11.29 |
-29:08:03.9 |
HIP 74612 |
19.87 |
| 2026-06-14 12:00 |
15:16:03.37 |
-29:07:18.1 |
HIP 74612 |
18.04 |
| 2026-06-15 00:00 |
15:15:55.50 |
-29:06:32.2 |
HIP 74612 |
16.23 |
| 2026-06-15 12:00 |
15:15:47.70 |
-29:05:46.3 |
HIP 74612 |
14.46 |
| 2026-06-16 00:00 |
15:15:39.96 |
-29:05:00.3 |
HIP 74612 |
12.72 |
| 2026-06-16 12:00 |
15:15:32.29 |
-29:04:14.4 |
HIP 74612 |
11.04 |
| 2026-06-17 00:00 |
15:15:24.67 |
-29:03:28.4 |
HIP 74612 |
9.43 |
| 2026-06-17 12:00 |
15:15:17.12 |
-29:02:42.4 |
HIP 74612 |
7.93 |
| 2026-06-18 00:00 |
15:15:09.63 |
-29:01:56.4 |
HIP 74612 |
6.60 |
| 2026-06-18 12:00 |
15:15:02.21 |
-29:01:10.4 |
HIP 74612 |
5.57 |
| 2026-06-19 00:00 |
15:14:54.85 |
-29:00:24.5 |
HIP 74612 |
4.99 |
| 2026-06-19 12:00 |
15:14:47.56 |
-28:59:38.5 |
HIP 74612 |
5.02 |
| 2026-06-20 00:00 |
15:14:40.34 |
-28:58:52.5 |
HIP 74612 |
5.64 |
| 2026-06-20 12:00 |
15:14:33.19 |
-28:58:06.6 |
HIP 74612 |
6.66 |
| 2026-06-21 00:00 |
15:14:26.10 |
-28:57:20.7 |
HIP 74612 |
7.94 |
| 2026-06-21 12:00 |
15:14:19.08 |
-28:56:34.8 |
HIP 74524 |
8.24 |
| 2026-06-22 00:00 |
15:14:12.13 |
-28:55:49.0 |
HIP 74524 |
7.12 |