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) |
| 2026-03-26 00:00 |
05:26:50.74 |
+03:22:03.9 |
HIP 25477 |
14.84 |
| 2026-03-26 12:00 |
05:26:52.69 |
+03:22:32.5 |
HIP 25477 |
14.34 |
| 2026-03-27 00:00 |
05:26:54.69 |
+03:23:01.0 |
HIP 25477 |
13.86 |
| 2026-03-27 12:00 |
05:26:56.74 |
+03:23:29.5 |
HIP 25477 |
13.40 |
| 2026-03-28 00:00 |
05:26:58.84 |
+03:23:57.9 |
HIP 25477 |
12.97 |
| 2026-03-28 12:00 |
05:27:00.99 |
+03:24:26.2 |
HIP 25477 |
12.56 |
| 2026-03-29 00:00 |
05:27:03.19 |
+03:24:54.5 |
HIP 25477 |
12.18 |
| 2026-03-29 12:00 |
05:27:05.44 |
+03:25:22.7 |
HIP 25477 |
11.83 |
| 2026-03-30 00:00 |
05:27:07.74 |
+03:25:50.9 |
HIP 25477 |
11.53 |
| 2026-03-30 12:00 |
05:27:10.09 |
+03:26:18.9 |
HIP 25477 |
11.28 |
| 2026-03-31 00:00 |
05:27:12.49 |
+03:26:47.0 |
HIP 25477 |
11.07 |
| 2026-03-31 12:00 |
05:27:14.93 |
+03:27:14.9 |
HIP 25477 |
10.92 |
| 2026-04-01 00:00 |
05:27:17.43 |
+03:27:42.8 |
HIP 25477 |
10.84 |
| 2026-04-01 12:00 |
05:27:19.97 |
+03:28:10.5 |
HIP 25477 |
10.81 |
| 2026-04-02 00:00 |
05:27:22.56 |
+03:28:38.3 |
HIP 25477 |
10.85 |
| 2026-04-02 12:00 |
05:27:25.20 |
+03:29:05.9 |
HIP 25477 |
10.96 |
| 2026-04-03 00:00 |
05:27:27.88 |
+03:29:33.4 |
HIP 25477 |
11.13 |
| 2026-04-03 12:00 |
05:27:30.62 |
+03:30:00.9 |
HIP 25477 |
11.37 |
| 2026-04-04 00:00 |
05:27:33.40 |
+03:30:28.3 |
HIP 25591 |
11.39 |
| 2026-04-04 12:00 |
05:27:36.23 |
+03:30:55.6 |
HIP 25591 |
10.55 |
| 2026-04-05 00:00 |
05:27:39.10 |
+03:31:22.8 |
HIP 25591 |
9.71 |
| 2026-04-05 12:00 |
05:27:42.02 |
+03:31:49.9 |
HIP 25591 |
8.86 |
| 2026-04-06 00:00 |
05:27:44.99 |
+03:32:16.9 |
HIP 25591 |
8.00 |
| 2026-04-06 12:00 |
05:27:48.00 |
+03:32:43.8 |
HIP 25591 |
7.13 |
| 2026-04-07 00:00 |
05:27:51.06 |
+03:33:10.6 |
HIP 25591 |
6.27 |
| 2026-04-07 12:00 |
05:27:54.16 |
+03:33:37.4 |
HIP 25591 |
5.40 |
| 2026-04-08 00:00 |
05:27:57.31 |
+03:34:04.0 |
HIP 25591 |
4.53 |
| 2026-04-08 12:00 |
05:28:00.50 |
+03:34:30.5 |
HIP 25591 |
3.68 |
| 2026-04-09 00:00 |
05:28:03.74 |
+03:34:56.9 |
HIP 25591 |
2.85 |
| 2026-04-09 12:00 |
05:28:07.03 |
+03:35:23.2 |
HIP 25591 |
2.11 |
| 2026-04-10 00:00 |
05:28:10.35 |
+03:35:49.4 |
HIP 25591 |
1.58 |
| 2026-04-10 12:00 |
05:28:13.73 |
+03:36:15.5 |
HIP 25591 |
1.52 |
| 2026-04-11 00:00 |
05:28:17.14 |
+03:36:41.5 |
HIP 25591 |
2.00 |
| 2026-04-11 12:00 |
05:28:20.60 |
+03:37:07.3 |
HIP 25591 |
2.75 |
| 2026-04-12 00:00 |
05:28:24.10 |
+03:37:33.1 |
HIP 25591 |
3.61 |
| 2026-04-12 12:00 |
05:28:27.65 |
+03:37:58.7 |
HIP 25591 |
4.53 |
| 2026-04-13 00:00 |
05:28:31.24 |
+03:38:24.2 |
HIP 25591 |
5.48 |
| 2026-04-13 12:00 |
05:28:34.87 |
+03:38:49.6 |
HIP 25591 |
6.46 |
| 2026-04-14 00:00 |
05:28:38.54 |
+03:39:14.8 |
HIP 25591 |
7.45 |
| 2026-04-14 12:00 |
05:28:42.26 |
+03:39:40.0 |
HIP 25591 |
8.45 |
| 2026-04-15 00:00 |
05:28:46.02 |
+03:40:05.0 |
HIP 25591 |
9.47 |
| 2026-04-15 12:00 |
05:28:49.82 |
+03:40:29.8 |
HIP 25591 |
10.49 |
| 2026-04-16 00:00 |
05:28:53.66 |
+03:40:54.6 |
HIP 25591 |
11.53 |