P/2018 V5 (Trujillo-Sheppard)
メタデータ
| 項目 |
値 |
| Designation |
P/2018 V5 (Trujillo-Sheppard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-03T20:45:02.079360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
21 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
19.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-11-06T12:29:37.939200Z |
| Discovery magnitude (MPC) |
22.21 G |
| Discovery observatory (MPC) |
T09 · Subaru Telescope, Maunakea |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-08-01.0000000 |
| e |
0.47462980 |
| q (au) |
4.707643 |
| a (au) |
8.960620 |
| i (deg) |
10.580193 |
| Ω (om, deg) |
171.328440 |
| ω (w, deg) |
260.805603 |
| M (ma, deg) |
357.653302 |
等級
散乱 + 全体線形
$$
M_a = (10.719 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.719 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.584 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
14:38:40.08 |
-07:42:36.2 |
HIP 71720 |
25.82 |
| 2026-02-03 12:00 |
14:38:42.20 |
-07:42:19.7 |
HIP 71720 |
25.23 |
| 2026-02-04 00:00 |
14:38:44.23 |
-07:42:02.8 |
HIP 71720 |
24.65 |
| 2026-02-04 12:00 |
14:38:46.17 |
-07:41:45.5 |
HIP 71720 |
24.09 |
| 2026-02-05 00:00 |
14:38:48.03 |
-07:41:27.7 |
HIP 71720 |
23.55 |
| 2026-02-05 12:00 |
14:38:49.80 |
-07:41:09.4 |
HIP 71720 |
23.02 |
| 2026-02-06 00:00 |
14:38:51.48 |
-07:40:50.8 |
HIP 71720 |
22.51 |
| 2026-02-06 12:00 |
14:38:53.07 |
-07:40:31.7 |
HIP 71720 |
22.02 |
| 2026-02-07 00:00 |
14:38:54.57 |
-07:40:12.1 |
HIP 71720 |
21.54 |
| 2026-02-07 12:00 |
14:38:55.99 |
-07:39:52.1 |
HIP 71720 |
21.08 |
| 2026-02-08 00:00 |
14:38:57.32 |
-07:39:31.7 |
HIP 71720 |
20.64 |
| 2026-02-08 12:00 |
14:38:58.56 |
-07:39:10.8 |
HIP 71720 |
20.21 |
| 2026-02-09 00:00 |
14:38:59.71 |
-07:38:49.5 |
HIP 71720 |
19.81 |
| 2026-02-09 12:00 |
14:39:00.77 |
-07:38:27.8 |
HIP 71720 |
19.43 |
| 2026-02-10 00:00 |
14:39:01.74 |
-07:38:05.6 |
HIP 71720 |
19.06 |
| 2026-02-10 12:00 |
14:39:02.62 |
-07:37:43.1 |
HIP 71720 |
18.72 |
| 2026-02-11 00:00 |
14:39:03.41 |
-07:37:20.0 |
HIP 71720 |
18.40 |
| 2026-02-11 12:00 |
14:39:04.12 |
-07:36:56.6 |
HIP 71720 |
18.10 |
| 2026-02-12 00:00 |
14:39:04.73 |
-07:36:32.7 |
HIP 71720 |
17.83 |
| 2026-02-12 12:00 |
14:39:05.26 |
-07:36:08.4 |
HIP 71720 |
17.58 |
| 2026-02-13 00:00 |
14:39:05.69 |
-07:35:43.7 |
HIP 71720 |
17.36 |
| 2026-02-13 12:00 |
14:39:06.04 |
-07:35:18.6 |
HIP 71720 |
17.16 |
| 2026-02-14 00:00 |
14:39:06.30 |
-07:34:53.0 |
HIP 71720 |
17.00 |
| 2026-02-14 12:00 |
14:39:06.46 |
-07:34:27.1 |
HIP 71720 |
16.86 |
| 2026-02-15 00:00 |
14:39:06.54 |
-07:34:00.7 |
HIP 71720 |
16.76 |
| 2026-02-15 12:00 |
14:39:06.53 |
-07:33:33.9 |
HIP 71720 |
16.68 |
| 2026-02-16 00:00 |
14:39:06.43 |
-07:33:06.7 |
HIP 71720 |
16.64 |
| 2026-02-16 12:00 |
14:39:06.24 |
-07:32:39.1 |
HIP 71720 |
16.63 |
| 2026-02-17 00:00 |
14:39:05.96 |
-07:32:11.1 |
HIP 71720 |
16.66 |
| 2026-02-17 12:00 |
14:39:05.59 |
-07:31:42.6 |
HIP 71720 |
16.72 |
| 2026-02-18 00:00 |
14:39:05.13 |
-07:31:13.8 |
HIP 71720 |
16.82 |
| 2026-02-18 12:00 |
14:39:04.58 |
-07:30:44.6 |
HIP 71720 |
16.95 |
| 2026-02-19 00:00 |
14:39:03.94 |
-07:30:15.0 |
HIP 71720 |
17.12 |
| 2026-02-19 12:00 |
14:39:03.22 |
-07:29:45.0 |
HIP 71720 |
17.33 |
| 2026-02-20 00:00 |
14:39:02.40 |
-07:29:14.5 |
HIP 71720 |
17.57 |
| 2026-02-20 12:00 |
14:39:01.50 |
-07:28:43.8 |
HIP 71720 |
17.85 |
| 2026-02-21 00:00 |
14:39:00.51 |
-07:28:12.6 |
HIP 71720 |
18.16 |
| 2026-02-21 12:00 |
14:38:59.43 |
-07:27:41.0 |
HIP 71720 |
18.51 |
| 2026-02-22 00:00 |
14:38:58.26 |
-07:27:09.1 |
HIP 71600 |
18.27 |
| 2026-02-22 12:00 |
14:38:57.01 |
-07:26:36.8 |
HIP 71600 |
17.66 |
| 2026-02-23 00:00 |
14:38:55.66 |
-07:26:04.1 |
HIP 71600 |
17.04 |
| 2026-02-23 12:00 |
14:38:54.23 |
-07:25:31.0 |
HIP 71600 |
16.41 |
| 2026-02-24 00:00 |
14:38:52.71 |
-07:24:57.6 |
HIP 71600 |
15.77 |