C/2019 D1 (Flewelling)
メタデータ
| 項目 |
値 |
| Designation |
C/2019 D1 (Flewelling) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-05-11T20:12:52.110720Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
797 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
15.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-02-26T15:28:50.505600Z |
| Discovery magnitude (MPC) |
16.75 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) |
2019-06-19.0000000 |
| e |
0.98854927 |
| q (au) |
1.577555 |
| a (au) |
137.768888 |
| i (deg) |
34.098372 |
| Ω (om, deg) |
231.717805 |
| ω (w, deg) |
70.477432 |
| M (ma, deg) |
0.023257 |
等級
散乱 + 全体線形
$$
M_a = (11.316 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.316 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-02-26 |
2019-05-11 |
+2.3057 |
-1.095 |
| 2019-05-12 |
2019-07-27 |
+16.0845 |
-3.717 |
| 2019-07-27 |
2019-12-04 |
-2.5143 |
+1.033 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
05:28:18.69 |
+02:36:28.6 |
HIP 25595 |
14.03 |
| 2026-02-03 12:00 |
05:28:15.09 |
+02:36:49.2 |
HIP 25595 |
14.27 |
| 2026-02-04 00:00 |
05:28:11.54 |
+02:37:10.1 |
HIP 25595 |
14.58 |
| 2026-02-04 12:00 |
05:28:08.04 |
+02:37:31.1 |
HIP 25595 |
14.94 |
| 2026-02-05 00:00 |
05:28:04.58 |
+02:37:52.4 |
HIP 25595 |
15.36 |
| 2026-02-05 12:00 |
05:28:01.18 |
+02:38:13.8 |
HIP 25595 |
15.82 |
| 2026-02-06 00:00 |
05:27:57.83 |
+02:38:35.4 |
HIP 25595 |
16.32 |
| 2026-02-06 12:00 |
05:27:54.53 |
+02:38:57.3 |
HIP 25595 |
16.86 |
| 2026-02-07 00:00 |
05:27:51.28 |
+02:39:19.3 |
HIP 25595 |
17.42 |
| 2026-02-07 12:00 |
05:27:48.08 |
+02:39:41.6 |
HIP 25595 |
18.01 |
| 2026-02-08 00:00 |
05:27:44.93 |
+02:40:04.0 |
HIP 25595 |
18.62 |
| 2026-02-08 12:00 |
05:27:41.84 |
+02:40:26.6 |
HIP 25595 |
19.25 |
| 2026-02-09 00:00 |
05:27:38.79 |
+02:40:49.4 |
HIP 25595 |
19.90 |
| 2026-02-09 12:00 |
05:27:35.80 |
+02:41:12.3 |
HIP 25595 |
20.55 |
| 2026-02-10 00:00 |
05:27:32.86 |
+02:41:35.5 |
HIP 25443 |
21.19 |
| 2026-02-10 12:00 |
05:27:29.98 |
+02:41:58.8 |
HIP 25443 |
20.40 |
| 2026-02-11 00:00 |
05:27:27.15 |
+02:42:22.3 |
HIP 25443 |
19.62 |
| 2026-02-11 12:00 |
05:27:24.37 |
+02:42:46.0 |
HIP 25443 |
18.85 |
| 2026-02-12 00:00 |
05:27:21.64 |
+02:43:09.8 |
HIP 25443 |
18.09 |
| 2026-02-12 12:00 |
05:27:18.97 |
+02:43:33.8 |
HIP 25443 |
17.34 |
| 2026-02-13 00:00 |
05:27:16.35 |
+02:43:58.0 |
HIP 25443 |
16.60 |
| 2026-02-13 12:00 |
05:27:13.78 |
+02:44:22.3 |
HIP 25443 |
15.87 |
| 2026-02-14 00:00 |
05:27:11.27 |
+02:44:46.8 |
HIP 25443 |
15.15 |
| 2026-02-14 12:00 |
05:27:08.82 |
+02:45:11.5 |
HIP 25443 |
14.43 |
| 2026-02-15 00:00 |
05:27:06.42 |
+02:45:36.3 |
HIP 25443 |
13.73 |
| 2026-02-15 12:00 |
05:27:04.07 |
+02:46:01.2 |
HIP 25443 |
13.04 |
| 2026-02-16 00:00 |
05:27:01.78 |
+02:46:26.4 |
HIP 25443 |
12.35 |
| 2026-02-16 12:00 |
05:26:59.54 |
+02:46:51.6 |
HIP 25443 |
11.68 |
| 2026-02-17 00:00 |
05:26:57.36 |
+02:47:17.0 |
HIP 25443 |
11.01 |
| 2026-02-17 12:00 |
05:26:55.23 |
+02:47:42.5 |
HIP 25443 |
10.36 |
| 2026-02-18 00:00 |
05:26:53.16 |
+02:48:08.2 |
HIP 25443 |
9.71 |
| 2026-02-18 12:00 |
05:26:51.15 |
+02:48:34.0 |
HIP 25443 |
9.07 |
| 2026-02-19 00:00 |
05:26:49.19 |
+02:49:00.0 |
HIP 25443 |
8.45 |
| 2026-02-19 12:00 |
05:26:47.29 |
+02:49:26.0 |
HIP 25443 |
7.83 |
| 2026-02-20 00:00 |
05:26:45.44 |
+02:49:52.2 |
HIP 25443 |
7.22 |
| 2026-02-20 12:00 |
05:26:43.65 |
+02:50:18.5 |
HIP 25443 |
6.62 |
| 2026-02-21 00:00 |
05:26:41.91 |
+02:50:45.0 |
HIP 25443 |
6.03 |
| 2026-02-21 12:00 |
05:26:40.23 |
+02:51:11.5 |
HIP 25443 |
5.45 |
| 2026-02-22 00:00 |
05:26:38.61 |
+02:51:38.2 |
HIP 25443 |
4.88 |
| 2026-02-22 12:00 |
05:26:37.04 |
+02:52:05.0 |
HIP 25443 |
4.32 |
| 2026-02-23 00:00 |
05:26:35.53 |
+02:52:31.9 |
HIP 25443 |
3.78 |
| 2026-02-23 12:00 |
05:26:34.08 |
+02:52:58.9 |
HIP 25443 |
3.25 |
| 2026-02-24 00:00 |
05:26:32.68 |
+02:53:26.0 |
HIP 25443 |
2.75 |