メタデータ
| 項目 |
値 |
| Designation |
C/2018 V2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-11-26T23:28:47.184960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
173 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-11-02T12:38:26.880000Z |
| Discovery magnitude (MPC) |
19.10 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-03-18.0000000 |
| e |
0.90288516 |
| q (au) |
2.474837 |
| a (au) |
25.483616 |
| i (deg) |
159.109919 |
| Ω (om, deg) |
356.790851 |
| ω (w, deg) |
318.662491 |
| M (ma, deg) |
0.850590 |
等級
散乱 + 全体線形
$$
M_a = (12.246 + 5.480\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.246 |
| n |
5.480 |
| gf |
1.000 |
| gb |
-0.951 |
| 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) |
| 2026-05-12 00:00 |
17:03:38.96 |
-01:17:39.7 |
HIP 83635 |
37.21 |
| 2026-05-12 12:00 |
17:03:31.67 |
-01:17:13.6 |
HIP 83635 |
38.35 |
| 2026-05-13 00:00 |
17:03:24.34 |
-01:16:47.7 |
HIP 83635 |
39.54 |
| 2026-05-13 12:00 |
17:03:16.99 |
-01:16:22.1 |
HIP 83635 |
40.80 |
| 2026-05-14 00:00 |
17:03:09.62 |
-01:15:56.8 |
HIP 83293 |
39.36 |
| 2026-05-14 12:00 |
17:03:02.22 |
-01:15:31.7 |
HIP 83293 |
37.81 |
| 2026-05-15 00:00 |
17:02:54.79 |
-01:15:06.9 |
HIP 83293 |
36.29 |
| 2026-05-15 12:00 |
17:02:47.34 |
-01:14:42.4 |
HIP 83293 |
34.81 |
| 2026-05-16 00:00 |
17:02:39.86 |
-01:14:18.1 |
HIP 83293 |
33.37 |
| 2026-05-16 12:00 |
17:02:32.37 |
-01:13:54.2 |
HIP 83293 |
31.98 |
| 2026-05-17 00:00 |
17:02:24.84 |
-01:13:30.5 |
HIP 83293 |
30.65 |
| 2026-05-17 12:00 |
17:02:17.30 |
-01:13:07.0 |
HIP 83293 |
29.39 |
| 2026-05-18 00:00 |
17:02:09.74 |
-01:12:43.9 |
HIP 83293 |
28.20 |
| 2026-05-18 12:00 |
17:02:02.15 |
-01:12:21.1 |
HIP 83293 |
27.11 |
| 2026-05-19 00:00 |
17:01:54.54 |
-01:11:58.5 |
HIP 83293 |
26.11 |
| 2026-05-19 12:00 |
17:01:46.92 |
-01:11:36.3 |
HIP 83293 |
25.23 |
| 2026-05-20 00:00 |
17:01:39.27 |
-01:11:14.3 |
HIP 83293 |
24.47 |
| 2026-05-20 12:00 |
17:01:31.61 |
-01:10:52.6 |
HIP 83293 |
23.85 |
| 2026-05-21 00:00 |
17:01:23.93 |
-01:10:31.2 |
HIP 83293 |
23.39 |
| 2026-05-21 12:00 |
17:01:16.23 |
-01:10:10.1 |
HIP 83293 |
23.08 |
| 2026-05-22 00:00 |
17:01:08.51 |
-01:09:49.3 |
HIP 83293 |
22.95 |
| 2026-05-22 12:00 |
17:01:00.78 |
-01:09:28.8 |
HIP 83293 |
22.98 |
| 2026-05-23 00:00 |
17:00:53.03 |
-01:09:08.6 |
HIP 83293 |
23.19 |
| 2026-05-23 12:00 |
17:00:45.27 |
-01:08:48.7 |
HIP 83215 |
22.48 |
| 2026-05-24 00:00 |
17:00:37.50 |
-01:08:29.1 |
HIP 83215 |
21.85 |
| 2026-05-24 12:00 |
17:00:29.71 |
-01:08:09.8 |
HIP 83215 |
21.38 |
| 2026-05-25 00:00 |
17:00:21.91 |
-01:07:50.8 |
HIP 83215 |
21.09 |
| 2026-05-25 12:00 |
17:00:14.09 |
-01:07:32.1 |
HIP 83215 |
20.99 |
| 2026-05-26 00:00 |
17:00:06.26 |
-01:07:13.8 |
HIP 83215 |
21.08 |
| 2026-05-26 12:00 |
16:59:58.43 |
-01:06:55.7 |
HIP 83215 |
21.36 |
| 2026-05-27 00:00 |
16:59:50.58 |
-01:06:38.0 |
HIP 83215 |
21.82 |
| 2026-05-27 12:00 |
16:59:42.72 |
-01:06:20.5 |
HIP 83215 |
22.46 |
| 2026-05-28 00:00 |
16:59:34.85 |
-01:06:03.4 |
HIP 83215 |
23.26 |
| 2026-05-28 12:00 |
16:59:26.97 |
-01:05:46.6 |
HIP 83031 |
21.42 |
| 2026-05-29 00:00 |
16:59:19.09 |
-01:05:30.0 |
HIP 83031 |
19.51 |
| 2026-05-29 12:00 |
16:59:11.20 |
-01:05:13.9 |
HIP 83031 |
17.62 |
| 2026-05-30 00:00 |
16:59:03.30 |
-01:04:58.0 |
HIP 83031 |
15.74 |
| 2026-05-30 12:00 |
16:58:55.39 |
-01:04:42.4 |
HIP 83031 |
13.90 |
| 2026-05-31 00:00 |
16:58:47.48 |
-01:04:27.2 |
HIP 83031 |
12.10 |
| 2026-05-31 12:00 |
16:58:39.56 |
-01:04:12.3 |
HIP 83031 |
10.37 |
| 2026-06-01 00:00 |
16:58:31.63 |
-01:03:57.7 |
HIP 83031 |
8.74 |
| 2026-06-01 12:00 |
16:58:23.70 |
-01:03:43.4 |
HIP 83031 |
7.30 |
| 2026-06-02 00:00 |
16:58:15.77 |
-01:03:29.5 |
HIP 83031 |
6.18 |