メタデータ
| 項目 |
値 |
| Designation |
C/2019 N1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-01T19:23:18.896640Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
1995 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-07-05T12:59:27.196800Z |
| Discovery magnitude (MPC) |
18.68 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) |
2020-04-21.0000000 |
| e |
0.99987028 |
| q (au) |
1.704628 |
| a (au) |
13141.158862 |
| i (deg) |
82.424795 |
| Ω (om, deg) |
13.576714 |
| ω (w, deg) |
193.445399 |
| M (ma, deg) |
359.999853 |
等級
散乱 + 全体線形
$$
M_a = (11.769 + 2.574\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.769 |
| n |
2.574 |
| gf |
1.000 |
| gb |
-0.684 |
| k |
0.800 |
| δ90 |
9.991 |
| 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 |
| 2019-06-10 |
2020-03-24 |
+2.0406 |
-1.471 |
| 2020-03-24 |
2020-11-29 |
-0.0339 |
-0.168 |
| 2020-12-03 |
2022-09-01 |
+3.3483 |
-1.177 |
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) |
| 2026-05-12 00:00 |
01:23:29.91 |
-16:36:10.8 |
HIP 6458 |
7.03 |
| 2026-05-12 12:00 |
01:23:35.65 |
-16:35:49.8 |
HIP 6458 |
8.23 |
| 2026-05-13 00:00 |
01:23:41.37 |
-16:35:29.3 |
HIP 6458 |
9.48 |
| 2026-05-13 12:00 |
01:23:47.05 |
-16:35:09.2 |
HIP 6458 |
10.77 |
| 2026-05-14 00:00 |
01:23:52.71 |
-16:34:49.6 |
HIP 6458 |
12.08 |
| 2026-05-14 12:00 |
01:23:58.34 |
-16:34:30.5 |
HIP 6458 |
13.40 |
| 2026-05-15 00:00 |
01:24:03.95 |
-16:34:11.9 |
HIP 6458 |
14.72 |
| 2026-05-15 12:00 |
01:24:09.52 |
-16:33:53.7 |
HIP 6458 |
16.05 |
| 2026-05-16 00:00 |
01:24:15.07 |
-16:33:36.0 |
HIP 6458 |
17.38 |
| 2026-05-16 12:00 |
01:24:20.58 |
-16:33:18.8 |
HIP 6458 |
18.70 |
| 2026-05-17 00:00 |
01:24:26.06 |
-16:33:02.1 |
HIP 6458 |
20.02 |
| 2026-05-17 12:00 |
01:24:31.52 |
-16:32:45.9 |
HIP 6458 |
21.34 |
| 2026-05-18 00:00 |
01:24:36.94 |
-16:32:30.1 |
HIP 6458 |
22.65 |
| 2026-05-18 12:00 |
01:24:42.33 |
-16:32:14.8 |
HIP 6644 |
23.56 |
| 2026-05-19 00:00 |
01:24:47.69 |
-16:32:00.0 |
HIP 6644 |
23.43 |
| 2026-05-19 12:00 |
01:24:53.02 |
-16:31:45.7 |
HIP 6716 |
22.30 |
| 2026-05-20 00:00 |
01:24:58.31 |
-16:31:31.9 |
HIP 6716 |
21.03 |
| 2026-05-20 12:00 |
01:25:03.58 |
-16:31:18.5 |
HIP 6716 |
19.77 |
| 2026-05-21 00:00 |
01:25:08.81 |
-16:31:05.6 |
HIP 6716 |
18.53 |
| 2026-05-21 12:00 |
01:25:14.00 |
-16:30:53.2 |
HIP 6716 |
17.29 |
| 2026-05-22 00:00 |
01:25:19.16 |
-16:30:41.3 |
HIP 6716 |
16.07 |
| 2026-05-22 12:00 |
01:25:24.29 |
-16:30:29.9 |
HIP 6716 |
14.85 |
| 2026-05-23 00:00 |
01:25:29.38 |
-16:30:18.9 |
HIP 6716 |
13.65 |
| 2026-05-23 12:00 |
01:25:34.44 |
-16:30:08.4 |
HIP 6716 |
12.47 |
| 2026-05-24 00:00 |
01:25:39.46 |
-16:29:58.4 |
HIP 6716 |
11.30 |
| 2026-05-24 12:00 |
01:25:44.45 |
-16:29:48.9 |
HIP 6716 |
10.15 |
| 2026-05-25 00:00 |
01:25:49.40 |
-16:29:39.9 |
HIP 6716 |
9.02 |
| 2026-05-25 12:00 |
01:25:54.31 |
-16:29:31.3 |
HIP 6716 |
7.91 |
| 2026-05-26 00:00 |
01:25:59.19 |
-16:29:23.3 |
HIP 6716 |
6.84 |
| 2026-05-26 12:00 |
01:26:04.04 |
-16:29:15.7 |
HIP 6716 |
5.81 |
| 2026-05-27 00:00 |
01:26:08.84 |
-16:29:08.5 |
HIP 6716 |
4.85 |
| 2026-05-27 12:00 |
01:26:13.61 |
-16:29:01.9 |
HIP 6716 |
4.00 |
| 2026-05-28 00:00 |
01:26:18.34 |
-16:28:55.7 |
HIP 6716 |
3.33 |
| 2026-05-28 12:00 |
01:26:23.03 |
-16:28:50.1 |
HIP 6716 |
2.95 |
| 2026-05-29 00:00 |
01:26:27.68 |
-16:28:44.9 |
HIP 6716 |
2.97 |
| 2026-05-29 12:00 |
01:26:32.30 |
-16:28:40.1 |
HIP 6716 |
3.37 |
| 2026-05-30 00:00 |
01:26:36.87 |
-16:28:35.9 |
HIP 6716 |
4.04 |
| 2026-05-30 12:00 |
01:26:41.41 |
-16:28:32.1 |
HIP 6716 |
4.85 |
| 2026-05-31 00:00 |
01:26:45.91 |
-16:28:28.8 |
HIP 6716 |
5.74 |
| 2026-05-31 12:00 |
01:26:50.37 |
-16:28:26.0 |
HIP 6716 |
6.68 |
| 2026-06-01 00:00 |
01:26:54.78 |
-16:28:23.7 |
HIP 6716 |
7.63 |
| 2026-06-01 12:00 |
01:26:59.16 |
-16:28:21.8 |
HIP 6716 |
8.60 |
| 2026-06-02 00:00 |
01:27:03.50 |
-16:28:20.4 |
HIP 6716 |
9.58 |