272P/NEAT
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) |
| 2026-02-03 00:00 |
20:10:14.07 |
-22:26:43.3 |
HIP 99337 |
19.22 |
| 2026-02-03 12:00 |
20:10:36.66 |
-22:26:00.7 |
HIP 99337 |
21.01 |
| 2026-02-04 00:00 |
20:10:59.21 |
-22:25:18.0 |
HIP 99337 |
23.85 |
| 2026-02-04 12:00 |
20:11:21.74 |
-22:24:35.3 |
HIP 99337 |
27.41 |
| 2026-02-05 00:00 |
20:11:44.23 |
-22:23:52.6 |
HIP 99484 |
27.21 |
| 2026-02-05 12:00 |
20:12:06.69 |
-22:23:09.9 |
HIP 99636 |
25.50 |
| 2026-02-06 00:00 |
20:12:29.11 |
-22:22:27.2 |
HIP 99636 |
21.92 |
| 2026-02-06 12:00 |
20:12:51.50 |
-22:21:44.5 |
HIP 99636 |
19.12 |
| 2026-02-07 00:00 |
20:13:13.85 |
-22:21:01.9 |
HIP 99636 |
17.47 |
| 2026-02-07 12:00 |
20:13:36.17 |
-22:20:19.2 |
HIP 99636 |
17.30 |
| 2026-02-08 00:00 |
20:13:58.45 |
-22:19:36.5 |
HIP 99745 |
17.88 |
| 2026-02-08 12:00 |
20:14:20.69 |
-22:18:53.9 |
HIP 99745 |
16.56 |
| 2026-02-09 00:00 |
20:14:42.89 |
-22:18:11.3 |
HIP 99745 |
16.81 |
| 2026-02-09 12:00 |
20:15:05.05 |
-22:17:28.7 |
HIP 99745 |
18.56 |
| 2026-02-10 00:00 |
20:15:27.17 |
-22:16:46.2 |
HIP 99745 |
21.45 |
| 2026-02-10 12:00 |
20:15:49.25 |
-22:16:03.6 |
HIP 99745 |
25.07 |
| 2026-02-11 00:00 |
20:16:11.29 |
-22:15:21.2 |
HIP 99745 |
29.15 |
| 2026-02-11 12:00 |
20:16:33.29 |
-22:14:38.7 |
HIP 100067 |
26.01 |
| 2026-02-12 00:00 |
20:16:55.24 |
-22:13:56.3 |
HIP 100067 |
21.54 |
| 2026-02-12 12:00 |
20:17:17.15 |
-22:13:14.0 |
HIP 100067 |
17.46 |
| 2026-02-13 00:00 |
20:17:39.01 |
-22:12:31.7 |
HIP 100067 |
14.07 |
| 2026-02-13 12:00 |
20:18:00.83 |
-22:11:49.5 |
HIP 100067 |
11.98 |
| 2026-02-14 00:00 |
20:18:22.60 |
-22:11:07.3 |
HIP 100067 |
11.88 |
| 2026-02-14 12:00 |
20:18:44.33 |
-22:10:25.3 |
HIP 100181 |
6.92 |
| 2026-02-15 00:00 |
20:19:06.01 |
-22:09:43.2 |
HIP 100181 |
2.45 |
| 2026-02-15 12:00 |
20:19:27.64 |
-22:09:01.3 |
HIP 100181 |
3.93 |
| 2026-02-16 00:00 |
20:19:49.21 |
-22:08:19.5 |
HIP 100257 |
3.06 |
| 2026-02-16 12:00 |
20:20:10.74 |
-22:07:37.7 |
HIP 100257 |
2.05 |
| 2026-02-17 00:00 |
20:20:32.22 |
-22:06:56.0 |
HIP 100257 |
7.04 |
| 2026-02-17 12:00 |
20:20:53.65 |
-22:06:14.4 |
HIP 100257 |
12.05 |
| 2026-02-18 00:00 |
20:21:15.02 |
-22:05:32.9 |
HIP 100257 |
17.04 |
| 2026-02-18 12:00 |
20:21:36.34 |
-22:04:51.6 |
HIP 100257 |
22.03 |
| 2026-02-19 00:00 |
20:21:57.61 |
-22:04:10.3 |
HIP 100257 |
27.00 |
| 2026-02-19 12:00 |
20:22:18.82 |
-22:03:29.1 |
HIP 100637 |
28.37 |
| 2026-02-20 00:00 |
20:22:39.98 |
-22:02:48.1 |
HIP 100637 |
23.47 |
| 2026-02-20 12:00 |
20:23:01.08 |
-22:02:07.2 |
HIP 100637 |
18.60 |
| 2026-02-21 00:00 |
20:23:22.12 |
-22:01:26.4 |
HIP 100637 |
13.79 |
| 2026-02-21 12:00 |
20:23:43.11 |
-22:00:45.7 |
HIP 100637 |
9.11 |
| 2026-02-22 00:00 |
20:24:04.03 |
-22:00:05.2 |
HIP 100637 |
4.92 |
| 2026-02-22 12:00 |
20:24:24.90 |
-21:59:24.8 |
HIP 100637 |
3.64 |
| 2026-02-23 00:00 |
20:24:45.71 |
-21:58:44.6 |
HIP 100637 |
7.06 |
| 2026-02-23 12:00 |
20:25:06.45 |
-21:58:04.5 |
HIP 100637 |
11.56 |
| 2026-02-24 00:00 |
20:25:27.14 |
-21:57:24.6 |
HIP 100637 |
16.25 |