メタデータ
| 項目 |
値 |
| Designation |
272P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-03-01T17:20:56.927040Z |
| Orbit solution date (soln_date, UTC) |
2023-02-22T00:13:19Z |
| Obs used |
189 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
18.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-04-10.0000000 |
| e |
0.45652880 |
| q (au) |
2.416276 |
| a (au) |
4.446005 |
| i (deg) |
18.188178 |
| Ω (om, deg) |
111.515253 |
| ω (w, deg) |
26.202307 |
| M (ma, deg) |
248.900968 |
等級
散乱 + 全体線形
$$
M_a = (16.618 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.618 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
20:59:27.76 |
-22:03:57.5 |
HIP 103398 |
36.11 |
| 2026-06-01 12:00 |
20:59:24.43 |
-22:05:01.5 |
HIP 103398 |
35.46 |
| 2026-06-02 00:00 |
20:59:20.94 |
-22:06:06.2 |
HIP 103398 |
34.82 |
| 2026-06-02 12:00 |
20:59:17.29 |
-22:07:11.5 |
HIP 103398 |
34.18 |
| 2026-06-03 00:00 |
20:59:13.47 |
-22:08:17.5 |
HIP 103398 |
33.56 |
| 2026-06-03 12:00 |
20:59:09.49 |
-22:09:24.2 |
HIP 103398 |
32.95 |
| 2026-06-04 00:00 |
20:59:05.34 |
-22:10:31.4 |
HIP 103398 |
32.36 |
| 2026-06-04 12:00 |
20:59:01.03 |
-22:11:39.4 |
HIP 103398 |
31.80 |
| 2026-06-05 00:00 |
20:58:56.56 |
-22:12:47.9 |
HIP 103398 |
31.27 |
| 2026-06-05 12:00 |
20:58:51.93 |
-22:13:57.1 |
HIP 103398 |
30.78 |
| 2026-06-06 00:00 |
20:58:47.14 |
-22:15:07.0 |
HIP 103398 |
30.33 |
| 2026-06-06 12:00 |
20:58:42.18 |
-22:16:17.4 |
HIP 103398 |
29.94 |
| 2026-06-07 00:00 |
20:58:37.06 |
-22:17:28.5 |
HIP 103398 |
29.61 |
| 2026-06-07 12:00 |
20:58:31.78 |
-22:18:40.2 |
HIP 103398 |
29.36 |
| 2026-06-08 00:00 |
20:58:26.34 |
-22:19:52.5 |
HIP 103398 |
29.17 |
| 2026-06-08 12:00 |
20:58:20.74 |
-22:21:05.4 |
HIP 103398 |
29.08 |
| 2026-06-09 00:00 |
20:58:14.98 |
-22:22:18.9 |
HIP 103398 |
29.07 |
| 2026-06-09 12:00 |
20:58:09.05 |
-22:23:33.0 |
HIP 103398 |
29.16 |
| 2026-06-10 00:00 |
20:58:02.97 |
-22:24:47.6 |
HIP 103398 |
29.36 |
| 2026-06-10 12:00 |
20:57:56.73 |
-22:26:02.9 |
HIP 103398 |
29.67 |
| 2026-06-11 00:00 |
20:57:50.32 |
-22:27:18.7 |
HIP 103398 |
30.08 |
| 2026-06-11 12:00 |
20:57:43.76 |
-22:28:35.2 |
HIP 103494 |
29.20 |
| 2026-06-12 00:00 |
20:57:37.04 |
-22:29:52.1 |
HIP 103494 |
28.26 |
| 2026-06-12 12:00 |
20:57:30.17 |
-22:31:09.7 |
HIP 103494 |
27.43 |
| 2026-06-13 00:00 |
20:57:23.13 |
-22:32:27.7 |
HIP 103494 |
26.74 |
| 2026-06-13 12:00 |
20:57:15.94 |
-22:33:46.4 |
HIP 103494 |
26.20 |
| 2026-06-14 00:00 |
20:57:08.59 |
-22:35:05.5 |
HIP 103494 |
25.84 |
| 2026-06-14 12:00 |
20:57:01.09 |
-22:36:25.2 |
HIP 103494 |
25.66 |
| 2026-06-15 00:00 |
20:56:53.43 |
-22:37:45.4 |
HIP 103494 |
25.68 |
| 2026-06-15 12:00 |
20:56:45.62 |
-22:39:06.1 |
HIP 103494 |
25.92 |
| 2026-06-16 00:00 |
20:56:37.66 |
-22:40:27.4 |
HIP 103253 |
24.03 |
| 2026-06-16 12:00 |
20:56:29.54 |
-22:41:49.1 |
HIP 103253 |
21.75 |
| 2026-06-17 00:00 |
20:56:21.27 |
-22:43:11.3 |
HIP 103253 |
19.44 |
| 2026-06-17 12:00 |
20:56:12.85 |
-22:44:33.9 |
HIP 103253 |
17.11 |
| 2026-06-18 00:00 |
20:56:04.29 |
-22:45:57.1 |
HIP 103253 |
14.76 |
| 2026-06-18 12:00 |
20:55:55.57 |
-22:47:20.7 |
HIP 103253 |
12.41 |
| 2026-06-19 00:00 |
20:55:46.71 |
-22:48:44.8 |
HIP 103253 |
10.06 |
| 2026-06-19 12:00 |
20:55:37.69 |
-22:50:09.3 |
HIP 103253 |
7.75 |
| 2026-06-20 00:00 |
20:55:28.54 |
-22:51:34.2 |
HIP 103253 |
5.60 |
| 2026-06-20 12:00 |
20:55:19.24 |
-22:52:59.6 |
HIP 103253 |
3.91 |
| 2026-06-21 00:00 |
20:55:09.79 |
-22:54:25.3 |
HIP 103253 |
3.52 |
| 2026-06-21 12:00 |
20:55:00.21 |
-22:55:51.5 |
HIP 103253 |
4.81 |
| 2026-06-22 00:00 |
20:54:50.48 |
-22:57:18.1 |
HIP 103253 |
6.93 |