メタデータ
| 項目 |
値 |
| Designation |
C/2019 M4 (TESS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-10T05:31:11.516160Z |
| Orbit solution date (soln_date, UTC) |
2023-05-11T17:42:03Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
4.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-27T02:44:30.768000Z |
| Discovery magnitude (MPC) |
18.90 G |
| Discovery observatory (MPC) |
C57 · TESS |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-09-26.0000000 |
| e |
1.00453441 |
| q (au) |
9.181017 |
| a (au) |
-2024.743895 |
| i (deg) |
65.710801 |
| Ω (om, deg) |
52.573407 |
| ω (w, deg) |
260.252031 |
| M (ma, deg) |
0.000171 |
等級
散乱 + 全体線形
$$
M_a = (-1.187 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-1.187 |
| n |
6.000 |
| gf |
0.965 |
| gb |
-0.974 |
| k |
1.000 |
| δ90 |
9.950 |
| 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 |
03:09:05.15 |
+01:07:24.1 |
HIP 14539 |
21.23 |
| 2026-05-12 12:00 |
03:09:12.12 |
+01:08:18.2 |
HIP 14539 |
22.75 |
| 2026-05-13 00:00 |
03:09:19.10 |
+01:09:12.0 |
HIP 14696 |
21.45 |
| 2026-05-13 12:00 |
03:09:26.07 |
+01:10:05.6 |
HIP 14696 |
20.01 |
| 2026-05-14 00:00 |
03:09:33.04 |
+01:10:58.8 |
HIP 14696 |
18.66 |
| 2026-05-14 12:00 |
03:09:40.00 |
+01:11:51.8 |
HIP 14696 |
17.44 |
| 2026-05-15 00:00 |
03:09:46.96 |
+01:12:44.5 |
HIP 14696 |
16.36 |
| 2026-05-15 12:00 |
03:09:53.92 |
+01:13:37.0 |
HIP 14696 |
15.46 |
| 2026-05-16 00:00 |
03:10:00.87 |
+01:14:29.2 |
HIP 14696 |
14.76 |
| 2026-05-16 12:00 |
03:10:07.81 |
+01:15:21.1 |
HIP 14696 |
14.30 |
| 2026-05-17 00:00 |
03:10:14.75 |
+01:16:12.7 |
HIP 14696 |
14.10 |
| 2026-05-17 12:00 |
03:10:21.69 |
+01:17:04.0 |
HIP 14696 |
14.17 |
| 2026-05-18 00:00 |
03:10:28.61 |
+01:17:55.1 |
HIP 14696 |
14.50 |
| 2026-05-18 12:00 |
03:10:35.53 |
+01:18:45.9 |
HIP 14696 |
15.07 |
| 2026-05-19 00:00 |
03:10:42.44 |
+01:19:36.4 |
HIP 14696 |
15.86 |
| 2026-05-19 12:00 |
03:10:49.35 |
+01:20:26.6 |
HIP 14696 |
16.83 |
| 2026-05-20 00:00 |
03:10:56.24 |
+01:21:16.5 |
HIP 14696 |
17.95 |
| 2026-05-20 12:00 |
03:11:03.13 |
+01:22:06.2 |
HIP 14696 |
19.20 |
| 2026-05-21 00:00 |
03:11:10.01 |
+01:22:55.5 |
HIP 14696 |
20.56 |
| 2026-05-21 12:00 |
03:11:16.88 |
+01:23:44.6 |
HIP 14696 |
21.99 |
| 2026-05-22 00:00 |
03:11:23.74 |
+01:24:33.4 |
HIP 14696 |
23.49 |
| 2026-05-22 12:00 |
03:11:30.58 |
+01:25:21.9 |
HIP 14696 |
25.03 |
| 2026-05-23 00:00 |
03:11:37.42 |
+01:26:10.1 |
HIP 14696 |
26.63 |
| 2026-05-23 12:00 |
03:11:44.25 |
+01:26:58.0 |
HIP 15008 |
25.77 |
| 2026-05-24 00:00 |
03:11:51.06 |
+01:27:45.6 |
HIP 15008 |
24.12 |
| 2026-05-24 12:00 |
03:11:57.86 |
+01:28:32.9 |
HIP 15008 |
22.51 |
| 2026-05-25 00:00 |
03:12:04.66 |
+01:29:20.0 |
HIP 15008 |
20.93 |
| 2026-05-25 12:00 |
03:12:11.43 |
+01:30:06.7 |
HIP 15008 |
19.42 |
| 2026-05-26 00:00 |
03:12:18.20 |
+01:30:53.2 |
HIP 15008 |
17.97 |
| 2026-05-26 12:00 |
03:12:24.95 |
+01:31:39.3 |
HIP 15008 |
16.61 |
| 2026-05-27 00:00 |
03:12:31.69 |
+01:32:25.2 |
HIP 15008 |
15.35 |
| 2026-05-27 12:00 |
03:12:38.41 |
+01:33:10.8 |
HIP 15008 |
14.22 |
| 2026-05-28 00:00 |
03:12:45.12 |
+01:33:56.1 |
HIP 15008 |
13.25 |
| 2026-05-28 12:00 |
03:12:51.81 |
+01:34:41.1 |
HIP 15008 |
12.47 |
| 2026-05-29 00:00 |
03:12:58.49 |
+01:35:25.7 |
HIP 15008 |
11.93 |
| 2026-05-29 12:00 |
03:13:05.15 |
+01:36:10.1 |
HIP 15008 |
11.66 |
| 2026-05-30 00:00 |
03:13:11.80 |
+01:36:54.2 |
HIP 15008 |
11.65 |
| 2026-05-30 12:00 |
03:13:18.43 |
+01:37:38.0 |
HIP 15008 |
11.93 |
| 2026-05-31 00:00 |
03:13:25.05 |
+01:38:21.5 |
HIP 15008 |
12.46 |
| 2026-05-31 12:00 |
03:13:31.65 |
+01:39:04.7 |
HIP 15008 |
13.21 |
| 2026-06-01 00:00 |
03:13:38.23 |
+01:39:47.6 |
HIP 15008 |
14.15 |
| 2026-06-01 12:00 |
03:13:44.79 |
+01:40:30.2 |
HIP 15008 |
15.23 |
| 2026-06-02 00:00 |
03:13:51.34 |
+01:41:12.5 |
HIP 15008 |
16.44 |