メタデータ
| 項目 |
値 |
| Designation |
C/2014 U3 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-09-02T20:08:26.016000Z |
| Orbit solution date (soln_date, UTC) |
2022-08-01T03:23:53Z |
| Obs used |
51 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
29.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-13.0000000 |
| e |
0.99332244 |
| q (au) |
2.555822 |
| a (au) |
382.748050 |
| i (deg) |
152.993159 |
| Ω (om, deg) |
163.558521 |
| ω (w, deg) |
51.065952 |
| M (ma, deg) |
0.005286 |
等級
散乱 + 全体線形
$$
M_a = (10.351 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.351 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-09-20 00:00 |
22:13:02.96 |
-18:55:00.7 |
HIP 109794 |
27.06 |
| 2026-09-20 12:00 |
22:12:58.72 |
-18:55:21.8 |
HIP 109794 |
27.49 |
| 2026-09-21 00:00 |
22:12:54.49 |
-18:55:42.8 |
HIP 109794 |
27.96 |
| 2026-09-21 12:00 |
22:12:50.29 |
-18:56:03.5 |
HIP 109721 |
28.21 |
| 2026-09-22 00:00 |
22:12:46.10 |
-18:56:24.1 |
HIP 109721 |
28.21 |
| 2026-09-22 12:00 |
22:12:41.94 |
-18:56:44.5 |
HIP 109721 |
28.25 |
| 2026-09-23 00:00 |
22:12:37.79 |
-18:57:04.7 |
HIP 109721 |
28.34 |
| 2026-09-23 12:00 |
22:12:33.66 |
-18:57:24.7 |
HIP 109721 |
28.46 |
| 2026-09-24 00:00 |
22:12:29.56 |
-18:57:44.6 |
HIP 109721 |
28.62 |
| 2026-09-24 12:00 |
22:12:25.47 |
-18:58:04.2 |
HIP 109721 |
28.81 |
| 2026-09-25 00:00 |
22:12:21.41 |
-18:58:23.7 |
HIP 109721 |
29.04 |
| 2026-09-25 12:00 |
22:12:17.37 |
-18:58:43.0 |
HIP 109721 |
29.30 |
| 2026-09-26 00:00 |
22:12:13.35 |
-18:59:02.1 |
HIP 109721 |
29.59 |
| 2026-09-26 12:00 |
22:12:09.35 |
-18:59:21.0 |
HIP 109721 |
29.91 |
| 2026-09-27 00:00 |
22:12:05.37 |
-18:59:39.7 |
HIP 109721 |
30.26 |
| 2026-09-27 12:00 |
22:12:01.42 |
-18:59:58.2 |
HIP 109721 |
30.64 |
| 2026-09-28 00:00 |
22:11:57.49 |
-19:00:16.6 |
HIP 109721 |
31.04 |
| 2026-09-28 12:00 |
22:11:53.58 |
-19:00:34.7 |
HIP 109721 |
31.47 |
| 2026-09-29 00:00 |
22:11:49.69 |
-19:00:52.7 |
HIP 109721 |
31.92 |
| 2026-09-29 12:00 |
22:11:45.83 |
-19:01:10.4 |
HIP 109721 |
32.39 |
| 2026-09-30 00:00 |
22:11:41.99 |
-19:01:28.0 |
HIP 109721 |
32.87 |
| 2026-09-30 12:00 |
22:11:38.18 |
-19:01:45.3 |
HIP 109721 |
33.38 |
| 2026-10-01 00:00 |
22:11:34.39 |
-19:02:02.5 |
HIP 109721 |
33.90 |
| 2026-10-01 12:00 |
22:11:30.62 |
-19:02:19.5 |
HIP 109721 |
34.44 |
| 2026-10-02 00:00 |
22:11:26.88 |
-19:02:36.2 |
HIP 109721 |
34.99 |
| 2026-10-02 12:00 |
22:11:23.17 |
-19:02:52.8 |
HIP 109721 |
35.55 |
| 2026-10-03 00:00 |
22:11:19.48 |
-19:03:09.2 |
HIP 109721 |
36.13 |
| 2026-10-03 12:00 |
22:11:15.81 |
-19:03:25.3 |
HIP 109721 |
36.71 |
| 2026-10-04 00:00 |
22:11:12.17 |
-19:03:41.3 |
HIP 109721 |
37.30 |
| 2026-10-04 12:00 |
22:11:08.56 |
-19:03:57.0 |
HIP 109721 |
37.91 |
| 2026-10-05 00:00 |
22:11:04.98 |
-19:04:12.6 |
HIP 109721 |
38.52 |
| 2026-10-05 12:00 |
22:11:01.42 |
-19:04:27.9 |
HIP 109721 |
39.13 |
| 2026-10-06 00:00 |
22:10:57.89 |
-19:04:43.1 |
HIP 109721 |
39.75 |
| 2026-10-06 12:00 |
22:10:54.38 |
-19:04:58.0 |
HIP 109721 |
40.38 |
| 2026-10-07 00:00 |
22:10:50.91 |
-19:05:12.7 |
HIP 109721 |
41.01 |
| 2026-10-07 12:00 |
22:10:47.46 |
-19:05:27.2 |
HIP 109721 |
41.65 |
| 2026-10-08 00:00 |
22:10:44.04 |
-19:05:41.5 |
HIP 109721 |
42.28 |
| 2026-10-08 12:00 |
22:10:40.65 |
-19:05:55.6 |
HIP 109332 |
42.27 |
| 2026-10-09 00:00 |
22:10:37.28 |
-19:06:09.5 |
HIP 109332 |
42.01 |
| 2026-10-09 12:00 |
22:10:33.95 |
-19:06:23.2 |
HIP 109332 |
41.77 |
| 2026-10-10 00:00 |
22:10:30.65 |
-19:06:36.6 |
HIP 109332 |
41.55 |
| 2026-10-10 12:00 |
22:10:27.37 |
-19:06:49.9 |
HIP 109332 |
41.34 |
| 2026-10-11 00:00 |
22:10:24.13 |
-19:07:02.9 |
HIP 109332 |
41.14 |