メタデータ
| 項目 |
値 |
| Designation |
299P/Catalina-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-04-30T19:01:29.798400Z |
| Orbit solution date (soln_date, UTC) |
2025-09-22T13:42:25Z |
| Obs used |
880 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
16.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-20.0000000 |
| e |
0.28157926 |
| q (au) |
3.150195 |
| a (au) |
4.384889 |
| i (deg) |
10.475280 |
| Ω (om, deg) |
271.625782 |
| ω (w, deg) |
323.895115 |
| M (ma, deg) |
237.868045 |
等級
散乱 + 全体線形
$$
M_a = (7.310 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.310 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-02-05 |
2024-04-22 |
+4.3053 |
-1.815 |
| 2024-05-02 |
2025-09-19 |
+24.4776 |
-13.053 |
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 |
23:34:56.36 |
+07:10:35.6 |
HIP 116486 |
27.21 |
| 2026-05-12 12:00 |
23:35:17.00 |
+07:13:42.2 |
HIP 116486 |
26.34 |
| 2026-05-13 00:00 |
23:35:37.53 |
+07:16:48.4 |
HIP 116486 |
26.83 |
| 2026-05-13 12:00 |
23:35:57.94 |
+07:19:54.2 |
HIP 116571 |
27.45 |
| 2026-05-14 00:00 |
23:36:18.25 |
+07:22:59.7 |
HIP 116571 |
21.62 |
| 2026-05-14 12:00 |
23:36:38.44 |
+07:26:04.7 |
HIP 116571 |
15.87 |
| 2026-05-15 00:00 |
23:36:58.53 |
+07:29:09.3 |
HIP 116571 |
10.29 |
| 2026-05-15 12:00 |
23:37:18.50 |
+07:32:13.4 |
HIP 116571 |
5.34 |
| 2026-05-16 00:00 |
23:37:38.35 |
+07:35:17.2 |
HIP 116571 |
4.33 |
| 2026-05-16 12:00 |
23:37:58.09 |
+07:38:20.5 |
HIP 116571 |
8.70 |
| 2026-05-17 00:00 |
23:38:17.72 |
+07:41:23.3 |
HIP 116571 |
14.08 |
| 2026-05-17 12:00 |
23:38:37.22 |
+07:44:25.7 |
HIP 116571 |
19.63 |
| 2026-05-18 00:00 |
23:38:56.61 |
+07:47:27.7 |
HIP 116816 |
23.63 |
| 2026-05-18 12:00 |
23:39:15.88 |
+07:50:29.2 |
HIP 116816 |
18.69 |
| 2026-05-19 00:00 |
23:39:35.04 |
+07:53:30.2 |
HIP 116816 |
14.31 |
| 2026-05-19 12:00 |
23:39:54.07 |
+07:56:30.7 |
HIP 116816 |
11.12 |
| 2026-05-20 00:00 |
23:40:12.98 |
+07:59:30.7 |
HIP 116816 |
10.27 |
| 2026-05-20 12:00 |
23:40:31.77 |
+08:02:30.3 |
HIP 116816 |
12.20 |
| 2026-05-21 00:00 |
23:40:50.44 |
+08:05:29.4 |
HIP 116837 |
14.55 |
| 2026-05-21 12:00 |
23:41:08.99 |
+08:08:27.9 |
HIP 116837 |
12.40 |
| 2026-05-22 00:00 |
23:41:27.42 |
+08:11:26.0 |
HIP 116837 |
12.47 |
| 2026-05-22 12:00 |
23:41:45.72 |
+08:14:23.6 |
HIP 116837 |
14.68 |
| 2026-05-23 00:00 |
23:42:03.89 |
+08:17:20.6 |
HIP 116837 |
18.24 |
| 2026-05-23 12:00 |
23:42:21.94 |
+08:20:17.2 |
HIP 116837 |
22.51 |
| 2026-05-24 00:00 |
23:42:39.87 |
+08:23:13.2 |
HIP 117098 |
25.41 |
| 2026-05-24 12:00 |
23:42:57.66 |
+08:26:08.6 |
HIP 117098 |
20.43 |
| 2026-05-25 00:00 |
23:43:15.33 |
+08:29:03.6 |
HIP 117098 |
15.69 |
| 2026-05-25 12:00 |
23:43:32.88 |
+08:31:58.0 |
HIP 117098 |
11.43 |
| 2026-05-26 00:00 |
23:43:50.29 |
+08:34:51.9 |
HIP 117098 |
8.37 |
| 2026-05-26 12:00 |
23:44:07.58 |
+08:37:45.2 |
HIP 117098 |
7.96 |
| 2026-05-27 00:00 |
23:44:24.73 |
+08:40:37.9 |
HIP 117098 |
10.47 |
| 2026-05-27 12:00 |
23:44:41.76 |
+08:43:30.2 |
HIP 117110 |
13.51 |
| 2026-05-28 00:00 |
23:44:58.65 |
+08:46:21.8 |
HIP 117110 |
17.48 |
| 2026-05-28 12:00 |
23:45:15.41 |
+08:49:12.9 |
HIP 117110 |
21.89 |
| 2026-05-29 00:00 |
23:45:32.04 |
+08:52:03.4 |
HIP 117110 |
26.49 |
| 2026-05-29 12:00 |
23:45:48.53 |
+08:54:53.3 |
HIP 117110 |
31.18 |
| 2026-05-30 00:00 |
23:46:04.90 |
+08:57:42.6 |
HIP 117110 |
35.92 |
| 2026-05-30 12:00 |
23:46:21.12 |
+09:00:31.4 |
HIP 117110 |
40.67 |
| 2026-05-31 00:00 |
23:46:37.21 |
+09:03:19.5 |
HIP 117236 |
44.05 |
| 2026-05-31 12:00 |
23:46:53.17 |
+09:06:07.1 |
HIP 117236 |
41.90 |
| 2026-06-01 00:00 |
23:47:08.99 |
+09:08:54.0 |
HIP 117236 |
40.22 |
| 2026-06-01 12:00 |
23:47:24.67 |
+09:11:40.4 |
HIP 117236 |
39.04 |
| 2026-06-02 00:00 |
23:47:40.21 |
+09:14:26.1 |
HIP 117236 |
38.42 |