メタデータ
| 項目 |
値 |
| Designation |
C/2018 X3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-12-30T19:11:56.958720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-12-12T11:04:53.472000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-12-10.0000000 |
| e |
0.78271953 |
| q (au) |
2.698917 |
| a (au) |
12.421353 |
| i (deg) |
43.369641 |
| Ω (om, deg) |
78.924758 |
| ω (w, deg) |
359.834482 |
| M (ma, deg) |
359.531712 |
等級
散乱 + 全体線形
$$
M_a = (16.711 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.711 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
15:49:41.93 |
+02:13:42.9 |
HIP 77578 |
9.10 |
| 2026-06-01 12:00 |
15:49:34.67 |
+02:13:43.3 |
HIP 77578 |
10.88 |
| 2026-06-02 00:00 |
15:49:27.42 |
+02:13:43.4 |
HIP 77578 |
12.66 |
| 2026-06-02 12:00 |
15:49:20.19 |
+02:13:43.0 |
HIP 77578 |
14.45 |
| 2026-06-03 00:00 |
15:49:12.99 |
+02:13:42.1 |
HIP 77578 |
16.24 |
| 2026-06-03 12:00 |
15:49:05.79 |
+02:13:40.9 |
HIP 77578 |
18.02 |
| 2026-06-04 00:00 |
15:48:58.62 |
+02:13:39.2 |
HIP 77578 |
19.80 |
| 2026-06-04 12:00 |
15:48:51.47 |
+02:13:37.0 |
HIP 77578 |
21.57 |
| 2026-06-05 00:00 |
15:48:44.34 |
+02:13:34.4 |
HIP 77371 |
22.73 |
| 2026-06-05 12:00 |
15:48:37.23 |
+02:13:31.4 |
HIP 77371 |
21.51 |
| 2026-06-06 00:00 |
15:48:30.15 |
+02:13:27.9 |
HIP 77371 |
20.37 |
| 2026-06-06 12:00 |
15:48:23.08 |
+02:13:24.0 |
HIP 77371 |
19.34 |
| 2026-06-07 00:00 |
15:48:16.04 |
+02:13:19.7 |
HIP 77371 |
18.43 |
| 2026-06-07 12:00 |
15:48:09.02 |
+02:13:14.9 |
HIP 77371 |
17.66 |
| 2026-06-08 00:00 |
15:48:02.03 |
+02:13:09.6 |
HIP 77371 |
17.04 |
| 2026-06-08 12:00 |
15:47:55.06 |
+02:13:03.9 |
HIP 77371 |
16.60 |
| 2026-06-09 00:00 |
15:47:48.12 |
+02:12:57.8 |
HIP 77371 |
16.33 |
| 2026-06-09 12:00 |
15:47:41.20 |
+02:12:51.2 |
HIP 77371 |
16.26 |
| 2026-06-10 00:00 |
15:47:34.31 |
+02:12:44.2 |
HIP 77371 |
16.38 |
| 2026-06-10 12:00 |
15:47:27.45 |
+02:12:36.7 |
HIP 77371 |
16.69 |
| 2026-06-11 00:00 |
15:47:20.62 |
+02:12:28.8 |
HIP 77371 |
17.16 |
| 2026-06-11 12:00 |
15:47:13.81 |
+02:12:20.5 |
HIP 77371 |
17.80 |
| 2026-06-12 00:00 |
15:47:07.04 |
+02:12:11.7 |
HIP 77371 |
18.57 |
| 2026-06-12 12:00 |
15:47:00.29 |
+02:12:02.4 |
HIP 77371 |
19.46 |
| 2026-06-13 00:00 |
15:46:53.58 |
+02:11:52.7 |
HIP 77371 |
20.46 |
| 2026-06-13 12:00 |
15:46:46.90 |
+02:11:42.6 |
HIP 77371 |
21.55 |
| 2026-06-14 00:00 |
15:46:40.24 |
+02:11:32.0 |
HIP 77371 |
22.70 |
| 2026-06-14 12:00 |
15:46:33.63 |
+02:11:21.0 |
HIP 77371 |
23.92 |
| 2026-06-15 00:00 |
15:46:27.04 |
+02:11:09.5 |
HIP 77371 |
25.19 |
| 2026-06-15 12:00 |
15:46:20.49 |
+02:10:57.6 |
HIP 77371 |
26.50 |
| 2026-06-16 00:00 |
15:46:13.97 |
+02:10:45.2 |
HIP 77371 |
27.85 |
| 2026-06-16 12:00 |
15:46:07.49 |
+02:10:32.4 |
HIP 77371 |
29.22 |
| 2026-06-17 00:00 |
15:46:01.04 |
+02:10:19.1 |
HIP 77100 |
28.84 |
| 2026-06-17 12:00 |
15:45:54.63 |
+02:10:05.4 |
HIP 77100 |
27.51 |
| 2026-06-18 00:00 |
15:45:48.26 |
+02:09:51.3 |
HIP 77100 |
26.21 |
| 2026-06-18 12:00 |
15:45:41.93 |
+02:09:36.7 |
HIP 77100 |
24.95 |
| 2026-06-19 00:00 |
15:45:35.63 |
+02:09:21.7 |
HIP 77100 |
23.74 |
| 2026-06-19 12:00 |
15:45:29.37 |
+02:09:06.3 |
HIP 77100 |
22.57 |
| 2026-06-20 00:00 |
15:45:23.15 |
+02:08:50.4 |
HIP 77100 |
21.45 |
| 2026-06-20 12:00 |
15:45:16.97 |
+02:08:34.0 |
HIP 77100 |
20.40 |
| 2026-06-21 00:00 |
15:45:10.83 |
+02:08:17.3 |
HIP 77100 |
19.41 |
| 2026-06-21 12:00 |
15:45:04.73 |
+02:08:00.1 |
HIP 77100 |
18.50 |
| 2026-06-22 00:00 |
15:44:58.67 |
+02:07:42.5 |
HIP 77100 |
17.67 |