427P/ATLAS
메타데이터
| 항목 |
값 |
| Designation |
427P/ATLAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-07-28T00:34:23.257920Z |
| Orbit solution date (soln_date, UTC) |
2021-10-08T07:06:18Z |
| Obs used |
434 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
19.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-06-09T01:43:41.059200Z |
| Discovery magnitude (MPC) |
24.00 G |
| Discovery observatory (MPC) |
I11 · Gemini South Observatory, Cerro Pachon |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-11-23.0000000 |
| e |
0.31304498 |
| q (au) |
2.178224 |
| a (au) |
3.170840 |
| i (deg) |
11.849372 |
| Ω (om, deg) |
252.391001 |
| ω (w, deg) |
99.944337 |
| M (ma, deg) |
20.593814 |
밝기
산란 + 전체 선형
$$
M_a = (20.000 + 3.940\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
20.000 |
| n |
3.940 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.840 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
11:57:57.66 |
-14:54:36.8 |
HIP 58424 |
12.22 |
| 2026-02-03 12:00 |
11:57:48.21 |
-14:55:02.1 |
HIP 58424 |
14.54 |
| 2026-02-04 00:00 |
11:57:38.54 |
-14:55:25.5 |
HIP 58424 |
16.90 |
| 2026-02-04 12:00 |
11:57:28.63 |
-14:55:46.9 |
HIP 58408 |
19.29 |
| 2026-02-05 00:00 |
11:57:18.49 |
-14:56:06.3 |
HIP 58408 |
21.16 |
| 2026-02-05 12:00 |
11:57:08.12 |
-14:56:23.7 |
HIP 58408 |
23.20 |
| 2026-02-06 00:00 |
11:56:57.52 |
-14:56:39.1 |
HIP 58408 |
25.40 |
| 2026-02-06 12:00 |
11:56:46.69 |
-14:56:52.6 |
HIP 58408 |
27.72 |
| 2026-02-07 00:00 |
11:56:35.64 |
-14:57:04.0 |
HIP 58408 |
30.16 |
| 2026-02-07 12:00 |
11:56:24.36 |
-14:57:13.4 |
HIP 58408 |
32.70 |
| 2026-02-08 00:00 |
11:56:12.85 |
-14:57:20.7 |
HIP 58408 |
35.32 |
| 2026-02-08 12:00 |
11:56:01.12 |
-14:57:26.0 |
HIP 58408 |
38.03 |
| 2026-02-09 00:00 |
11:55:49.18 |
-14:57:29.2 |
HIP 58408 |
40.82 |
| 2026-02-09 12:00 |
11:55:37.01 |
-14:57:30.4 |
HIP 57962 |
39.84 |
| 2026-02-10 00:00 |
11:55:24.62 |
-14:57:29.5 |
HIP 57962 |
37.36 |
| 2026-02-10 12:00 |
11:55:12.01 |
-14:57:26.6 |
HIP 57962 |
34.89 |
| 2026-02-11 00:00 |
11:54:59.19 |
-14:57:21.5 |
HIP 57962 |
32.47 |
| 2026-02-11 12:00 |
11:54:46.15 |
-14:57:14.4 |
HIP 57919 |
29.82 |
| 2026-02-12 00:00 |
11:54:32.90 |
-14:57:05.2 |
HIP 57919 |
26.67 |
| 2026-02-12 12:00 |
11:54:19.45 |
-14:56:53.9 |
HIP 57919 |
23.48 |
| 2026-02-13 00:00 |
11:54:05.78 |
-14:56:40.4 |
HIP 57919 |
20.26 |
| 2026-02-13 12:00 |
11:53:51.90 |
-14:56:24.9 |
HIP 57919 |
17.00 |
| 2026-02-14 00:00 |
11:53:37.83 |
-14:56:07.3 |
HIP 57919 |
13.74 |
| 2026-02-14 12:00 |
11:53:23.54 |
-14:55:47.5 |
HIP 57919 |
10.51 |
| 2026-02-15 00:00 |
11:53:09.06 |
-14:55:25.6 |
HIP 57919 |
7.45 |
| 2026-02-15 12:00 |
11:52:54.38 |
-14:55:01.6 |
HIP 57919 |
4.95 |
| 2026-02-16 00:00 |
11:52:39.51 |
-14:54:35.4 |
HIP 57919 |
4.36 |
| 2026-02-16 12:00 |
11:52:24.44 |
-14:54:07.2 |
HIP 57919 |
6.31 |
| 2026-02-17 00:00 |
11:52:09.18 |
-14:53:36.8 |
HIP 57919 |
9.40 |
| 2026-02-17 12:00 |
11:51:53.73 |
-14:53:04.2 |
HIP 57919 |
12.86 |
| 2026-02-18 00:00 |
11:51:38.09 |
-14:52:29.6 |
HIP 57789 |
12.07 |
| 2026-02-18 12:00 |
11:51:22.27 |
-14:51:52.8 |
HIP 57789 |
9.04 |
| 2026-02-19 00:00 |
11:51:06.27 |
-14:51:13.8 |
HIP 57789 |
6.85 |
| 2026-02-19 12:00 |
11:50:50.10 |
-14:50:32.8 |
HIP 57789 |
6.55 |
| 2026-02-20 00:00 |
11:50:33.74 |
-14:49:49.6 |
HIP 57789 |
8.39 |
| 2026-02-20 12:00 |
11:50:17.22 |
-14:49:04.3 |
HIP 57789 |
11.44 |
| 2026-02-21 00:00 |
11:50:00.53 |
-14:48:16.9 |
HIP 57789 |
15.01 |
| 2026-02-21 12:00 |
11:49:43.67 |
-14:47:27.3 |
HIP 57789 |
18.83 |
| 2026-02-22 00:00 |
11:49:26.64 |
-14:46:35.7 |
HIP 57789 |
22.81 |
| 2026-02-22 12:00 |
11:49:09.46 |
-14:45:41.9 |
HIP 57611 |
25.92 |
| 2026-02-23 00:00 |
11:48:52.12 |
-14:44:46.1 |
HIP 57611 |
24.24 |
| 2026-02-23 12:00 |
11:48:34.63 |
-14:43:48.1 |
HIP 57611 |
23.20 |
| 2026-02-24 00:00 |
11:48:16.99 |
-14:42:48.1 |
HIP 57611 |
22.92 |