253P/PANSTARRS
メタデータ
| 項目 |
値 |
| Designation |
253P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-07T16:43:41.024640Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:55Z |
| Obs used |
936 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
29.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-05-04.0000000 |
| e |
0.41304705 |
| q (au) |
2.036337 |
| a (au) |
3.469336 |
| i (deg) |
4.940807 |
| Ω (om, deg) |
146.875124 |
| ω (w, deg) |
230.708050 |
| M (ma, deg) |
55.106908 |
等級
散乱 + 全体線形
$$
M_a = (14.139 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.139 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.655 |
| 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 |
| 2024-05-08 |
2025-02-03 |
+31.1826 |
-9.791 |
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) |
| 2026-02-03 00:00 |
09:21:49.60 |
+14:13:41.8 |
HIP 46019 |
18.99 |
| 2026-02-03 12:00 |
09:21:25.91 |
+14:16:00.9 |
HIP 45778 |
23.42 |
| 2026-02-04 00:00 |
09:21:02.22 |
+14:18:19.9 |
HIP 45778 |
20.33 |
| 2026-02-04 12:00 |
09:20:38.52 |
+14:20:38.8 |
HIP 45778 |
18.85 |
| 2026-02-05 00:00 |
09:20:14.81 |
+14:22:57.6 |
HIP 45778 |
19.33 |
| 2026-02-05 12:00 |
09:19:51.12 |
+14:25:16.3 |
HIP 45778 |
21.65 |
| 2026-02-06 00:00 |
09:19:27.43 |
+14:27:34.9 |
HIP 45778 |
25.30 |
| 2026-02-06 12:00 |
09:19:03.76 |
+14:29:53.3 |
HIP 45778 |
29.80 |
| 2026-02-07 00:00 |
09:18:40.11 |
+14:32:11.5 |
HIP 45778 |
34.81 |
| 2026-02-07 12:00 |
09:18:16.49 |
+14:34:29.4 |
HIP 45474 |
37.95 |
| 2026-02-08 00:00 |
09:17:52.89 |
+14:36:47.1 |
HIP 45474 |
31.86 |
| 2026-02-08 12:00 |
09:17:29.34 |
+14:39:04.6 |
HIP 45474 |
25.81 |
| 2026-02-09 00:00 |
09:17:05.82 |
+14:41:21.7 |
HIP 45474 |
19.83 |
| 2026-02-09 12:00 |
09:16:42.36 |
+14:43:38.5 |
HIP 45474 |
13.99 |
| 2026-02-10 00:00 |
09:16:18.94 |
+14:45:54.9 |
HIP 45474 |
8.54 |
| 2026-02-10 12:00 |
09:15:55.59 |
+14:48:10.9 |
HIP 45474 |
4.99 |
| 2026-02-11 00:00 |
09:15:32.30 |
+14:50:26.5 |
HIP 45474 |
7.11 |
| 2026-02-11 12:00 |
09:15:09.07 |
+14:52:41.7 |
HIP 45410 |
3.97 |
| 2026-02-12 00:00 |
09:14:45.93 |
+14:54:56.4 |
HIP 45410 |
6.93 |
| 2026-02-12 12:00 |
09:14:22.86 |
+14:57:10.7 |
HIP 45410 |
12.34 |
| 2026-02-13 00:00 |
09:13:59.87 |
+14:59:24.4 |
HIP 45410 |
18.11 |
| 2026-02-13 12:00 |
09:13:36.98 |
+15:01:37.5 |
HIP 45170 |
19.20 |
| 2026-02-14 00:00 |
09:13:14.18 |
+15:03:50.1 |
HIP 45170 |
14.20 |
| 2026-02-14 12:00 |
09:12:51.48 |
+15:06:02.2 |
HIP 45170 |
10.28 |
| 2026-02-15 00:00 |
09:12:28.88 |
+15:08:13.6 |
HIP 45170 |
8.91 |
| 2026-02-15 12:00 |
09:12:06.40 |
+15:10:24.3 |
HIP 45170 |
11.03 |
| 2026-02-16 00:00 |
09:11:44.03 |
+15:12:34.4 |
HIP 45170 |
15.22 |
| 2026-02-16 12:00 |
09:11:21.78 |
+15:14:43.9 |
HIP 45170 |
20.21 |
| 2026-02-17 00:00 |
09:10:59.66 |
+15:16:52.6 |
HIP 45043 |
19.88 |
| 2026-02-17 12:00 |
09:10:37.66 |
+15:19:00.6 |
HIP 44985 |
14.31 |
| 2026-02-18 00:00 |
09:10:15.80 |
+15:21:07.8 |
HIP 44985 |
8.80 |
| 2026-02-18 12:00 |
09:09:54.09 |
+15:23:14.3 |
HIP 44985 |
3.86 |
| 2026-02-19 00:00 |
09:09:32.51 |
+15:25:20.0 |
HIP 44985 |
3.97 |
| 2026-02-19 12:00 |
09:09:11.09 |
+15:27:24.8 |
HIP 44985 |
8.88 |
| 2026-02-20 00:00 |
09:08:49.82 |
+15:29:28.9 |
HIP 44985 |
14.24 |
| 2026-02-20 12:00 |
09:08:28.71 |
+15:31:32.0 |
HIP 44985 |
19.65 |
| 2026-02-21 00:00 |
09:08:07.76 |
+15:33:34.3 |
HIP 44942 |
24.96 |
| 2026-02-21 12:00 |
09:07:46.98 |
+15:35:35.7 |
HIP 44723 |
27.00 |
| 2026-02-22 00:00 |
09:07:26.37 |
+15:37:36.2 |
HIP 44672 |
22.70 |
| 2026-02-22 12:00 |
09:07:05.94 |
+15:39:35.8 |
HIP 44672 |
17.67 |
| 2026-02-23 00:00 |
09:06:45.69 |
+15:41:34.4 |
HIP 44672 |
12.92 |
| 2026-02-23 12:00 |
09:06:25.62 |
+15:43:32.0 |
HIP 44672 |
8.79 |
| 2026-02-24 00:00 |
09:06:05.74 |
+15:45:28.7 |
HIP 44672 |
6.48 |