250P/Larson
メタデータ
| 項目 |
値 |
| Designation |
250P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-01T10:32:41.239680Z |
| Orbit solution date (soln_date, UTC) |
2025-02-28T13:42:30Z |
| Obs used |
530 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
9.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-04.0000000 |
| e |
0.40748718 |
| q (au) |
2.212069 |
| a (au) |
3.733369 |
| i (deg) |
13.291540 |
| Ω (om, deg) |
73.729877 |
| ω (w, deg) |
44.984010 |
| M (ma, deg) |
193.795336 |
等級
散乱 + 全体線形
$$
M_a = (18.493 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.493 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.692 |
| k |
0.930 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
14:27:44.56 |
-01:13:30.2 |
HIP 70611 |
18.68 |
| 2026-02-03 12:00 |
14:28:01.22 |
-01:13:44.7 |
HIP 70702 |
20.42 |
| 2026-02-04 00:00 |
14:28:17.56 |
-01:13:57.7 |
HIP 70702 |
22.07 |
| 2026-02-04 12:00 |
14:28:33.60 |
-01:14:08.9 |
HIP 70702 |
24.25 |
| 2026-02-05 00:00 |
14:28:49.33 |
-01:14:18.6 |
HIP 70702 |
26.78 |
| 2026-02-05 12:00 |
14:29:04.75 |
-01:14:26.6 |
HIP 70702 |
29.54 |
| 2026-02-06 00:00 |
14:29:19.86 |
-01:14:33.0 |
HIP 70965 |
26.03 |
| 2026-02-06 12:00 |
14:29:34.65 |
-01:14:37.7 |
HIP 70965 |
22.64 |
| 2026-02-07 00:00 |
14:29:49.13 |
-01:14:40.8 |
HIP 70965 |
19.44 |
| 2026-02-07 12:00 |
14:30:03.29 |
-01:14:42.3 |
HIP 70965 |
16.50 |
| 2026-02-08 00:00 |
14:30:17.13 |
-01:14:42.2 |
HIP 70965 |
13.92 |
| 2026-02-08 12:00 |
14:30:30.65 |
-01:14:40.5 |
HIP 70965 |
11.86 |
| 2026-02-09 00:00 |
14:30:43.84 |
-01:14:37.2 |
HIP 70965 |
10.55 |
| 2026-02-09 12:00 |
14:30:56.71 |
-01:14:32.2 |
HIP 70965 |
10.21 |
| 2026-02-10 00:00 |
14:31:09.26 |
-01:14:25.7 |
HIP 70965 |
10.86 |
| 2026-02-10 12:00 |
14:31:21.47 |
-01:14:17.6 |
HIP 70965 |
12.28 |
| 2026-02-11 00:00 |
14:31:33.36 |
-01:14:07.9 |
HIP 70965 |
14.19 |
| 2026-02-11 12:00 |
14:31:44.92 |
-01:13:56.6 |
HIP 70965 |
16.38 |
| 2026-02-12 00:00 |
14:31:56.14 |
-01:13:43.8 |
HIP 70965 |
18.70 |
| 2026-02-12 12:00 |
14:32:07.03 |
-01:13:29.4 |
HIP 70965 |
21.09 |
| 2026-02-13 00:00 |
14:32:17.58 |
-01:13:13.4 |
HIP 70965 |
23.49 |
| 2026-02-13 12:00 |
14:32:27.80 |
-01:12:55.9 |
HIP 71208 |
25.29 |
| 2026-02-14 00:00 |
14:32:37.67 |
-01:12:36.9 |
HIP 71208 |
23.22 |
| 2026-02-14 12:00 |
14:32:47.21 |
-01:12:16.3 |
HIP 71208 |
21.29 |
| 2026-02-15 00:00 |
14:32:56.41 |
-01:11:54.2 |
HIP 71208 |
19.49 |
| 2026-02-15 12:00 |
14:33:05.26 |
-01:11:30.6 |
HIP 71208 |
17.84 |
| 2026-02-16 00:00 |
14:33:13.77 |
-01:11:05.5 |
HIP 71208 |
16.36 |
| 2026-02-16 12:00 |
14:33:21.93 |
-01:10:38.9 |
HIP 71208 |
15.05 |
| 2026-02-17 00:00 |
14:33:29.75 |
-01:10:10.8 |
HIP 71208 |
13.94 |
| 2026-02-17 12:00 |
14:33:37.22 |
-01:09:41.3 |
HIP 71208 |
13.03 |
| 2026-02-18 00:00 |
14:33:44.34 |
-01:09:10.3 |
HIP 71208 |
12.34 |
| 2026-02-18 12:00 |
14:33:51.11 |
-01:08:37.8 |
HIP 71208 |
11.87 |
| 2026-02-19 00:00 |
14:33:57.53 |
-01:08:03.9 |
HIP 71208 |
11.60 |
| 2026-02-19 12:00 |
14:34:03.60 |
-01:07:28.7 |
HIP 71208 |
11.53 |
| 2026-02-20 00:00 |
14:34:09.32 |
-01:06:52.0 |
HIP 71208 |
11.62 |
| 2026-02-20 12:00 |
14:34:14.69 |
-01:06:13.9 |
HIP 71208 |
11.84 |
| 2026-02-21 00:00 |
14:34:19.70 |
-01:05:34.4 |
HIP 71208 |
12.16 |
| 2026-02-21 12:00 |
14:34:24.36 |
-01:04:53.6 |
HIP 71208 |
12.55 |
| 2026-02-22 00:00 |
14:34:28.66 |
-01:04:11.4 |
HIP 71208 |
12.98 |
| 2026-02-22 12:00 |
14:34:32.61 |
-01:03:27.9 |
HIP 71208 |
13.43 |
| 2026-02-23 00:00 |
14:34:36.20 |
-01:02:43.1 |
HIP 71208 |
13.89 |
| 2026-02-23 12:00 |
14:34:39.44 |
-01:01:57.0 |
HIP 71208 |
14.34 |
| 2026-02-24 00:00 |
14:34:42.32 |
-01:01:09.6 |
HIP 71208 |
14.76 |