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) |
| 2026-03-26 00:00 |
17:11:58.26 |
-02:11:50.8 |
HIP 84211 |
13.85 |
| 2026-03-26 12:00 |
17:11:55.40 |
-02:11:12.0 |
HIP 84211 |
14.73 |
| 2026-03-27 00:00 |
17:11:52.48 |
-02:10:33.3 |
HIP 84211 |
15.64 |
| 2026-03-27 12:00 |
17:11:49.51 |
-02:09:54.6 |
HIP 84211 |
16.57 |
| 2026-03-28 00:00 |
17:11:46.47 |
-02:09:15.8 |
HIP 84211 |
17.51 |
| 2026-03-28 12:00 |
17:11:43.37 |
-02:08:37.1 |
HIP 84123 |
17.71 |
| 2026-03-29 00:00 |
17:11:40.21 |
-02:07:58.4 |
HIP 84123 |
17.19 |
| 2026-03-29 12:00 |
17:11:36.99 |
-02:07:19.7 |
HIP 84123 |
16.73 |
| 2026-03-30 00:00 |
17:11:33.72 |
-02:06:41.0 |
HIP 84123 |
16.32 |
| 2026-03-30 12:00 |
17:11:30.38 |
-02:06:02.3 |
HIP 84123 |
15.97 |
| 2026-03-31 00:00 |
17:11:26.99 |
-02:05:23.7 |
HIP 84123 |
15.70 |
| 2026-03-31 12:00 |
17:11:23.54 |
-02:04:45.1 |
HIP 84123 |
15.50 |
| 2026-04-01 00:00 |
17:11:20.03 |
-02:04:06.5 |
HIP 84123 |
15.38 |
| 2026-04-01 12:00 |
17:11:16.46 |
-02:03:27.9 |
HIP 84123 |
15.34 |
| 2026-04-02 00:00 |
17:11:12.83 |
-02:02:49.4 |
HIP 84123 |
15.40 |
| 2026-04-02 12:00 |
17:11:09.15 |
-02:02:10.9 |
HIP 84123 |
15.54 |
| 2026-04-03 00:00 |
17:11:05.41 |
-02:01:32.4 |
HIP 84123 |
15.77 |
| 2026-04-03 12:00 |
17:11:01.61 |
-02:00:54.0 |
HIP 84123 |
16.10 |
| 2026-04-04 00:00 |
17:10:57.75 |
-02:00:15.7 |
HIP 84123 |
16.50 |
| 2026-04-04 12:00 |
17:10:53.83 |
-01:59:37.4 |
HIP 84123 |
16.99 |
| 2026-04-05 00:00 |
17:10:49.86 |
-01:58:59.1 |
HIP 84123 |
17.56 |
| 2026-04-05 12:00 |
17:10:45.84 |
-01:58:20.9 |
HIP 84123 |
18.20 |
| 2026-04-06 00:00 |
17:10:41.75 |
-01:57:42.8 |
HIP 84123 |
18.91 |
| 2026-04-06 12:00 |
17:10:37.61 |
-01:57:04.7 |
HIP 84123 |
19.67 |
| 2026-04-07 00:00 |
17:10:33.41 |
-01:56:26.6 |
HIP 84123 |
20.50 |
| 2026-04-07 12:00 |
17:10:29.16 |
-01:55:48.7 |
HIP 84123 |
21.38 |
| 2026-04-08 00:00 |
17:10:24.85 |
-01:55:10.8 |
HIP 84123 |
22.30 |
| 2026-04-08 12:00 |
17:10:20.49 |
-01:54:33.0 |
HIP 84123 |
23.27 |
| 2026-04-09 00:00 |
17:10:16.07 |
-01:53:55.2 |
HIP 84123 |
24.28 |
| 2026-04-09 12:00 |
17:10:11.59 |
-01:53:17.5 |
HIP 84123 |
25.33 |
| 2026-04-10 00:00 |
17:10:07.06 |
-01:52:39.9 |
HIP 83889 |
24.94 |
| 2026-04-10 12:00 |
17:10:02.48 |
-01:52:02.4 |
HIP 83889 |
24.36 |
| 2026-04-11 00:00 |
17:09:57.84 |
-01:51:25.0 |
HIP 83889 |
23.83 |
| 2026-04-11 12:00 |
17:09:53.15 |
-01:50:47.7 |
HIP 83889 |
23.35 |
| 2026-04-12 00:00 |
17:09:48.40 |
-01:50:10.5 |
HIP 83889 |
22.92 |
| 2026-04-12 12:00 |
17:09:43.60 |
-01:49:33.3 |
HIP 83889 |
22.56 |
| 2026-04-13 00:00 |
17:09:38.75 |
-01:48:56.3 |
HIP 83889 |
22.27 |
| 2026-04-13 12:00 |
17:09:33.84 |
-01:48:19.3 |
HIP 83889 |
22.04 |
| 2026-04-14 00:00 |
17:09:28.88 |
-01:47:42.5 |
HIP 83889 |
21.89 |
| 2026-04-14 12:00 |
17:09:23.87 |
-01:47:05.8 |
HIP 83889 |
21.82 |
| 2026-04-15 00:00 |
17:09:18.80 |
-01:46:29.2 |
HIP 83889 |
21.83 |
| 2026-04-15 12:00 |
17:09:13.69 |
-01:45:52.7 |
HIP 83889 |
21.93 |
| 2026-04-16 00:00 |
17:09:08.52 |
-01:45:16.3 |
HIP 83889 |
22.11 |