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) |
| 2026-05-12 00:00 |
11:09:50.59 |
-08:41:04.1 |
HIP 54599 |
22.56 |
| 2026-05-12 12:00 |
11:09:49.38 |
-08:39:06.7 |
HIP 54672 |
24.43 |
| 2026-05-13 00:00 |
11:09:48.40 |
-08:37:10.6 |
HIP 54672 |
24.81 |
| 2026-05-13 12:00 |
11:09:47.67 |
-08:35:16.0 |
HIP 54672 |
25.28 |
| 2026-05-14 00:00 |
11:09:47.18 |
-08:33:22.8 |
HIP 54672 |
25.82 |
| 2026-05-14 12:00 |
11:09:46.92 |
-08:31:31.1 |
HIP 54672 |
26.41 |
| 2026-05-15 00:00 |
11:09:46.90 |
-08:29:40.7 |
HIP 54672 |
27.06 |
| 2026-05-15 12:00 |
11:09:47.13 |
-08:27:51.8 |
HIP 54672 |
27.76 |
| 2026-05-16 00:00 |
11:09:47.58 |
-08:26:04.4 |
HIP 54672 |
28.49 |
| 2026-05-16 12:00 |
11:09:48.28 |
-08:24:18.4 |
HIP 54672 |
29.24 |
| 2026-05-17 00:00 |
11:09:49.21 |
-08:22:33.9 |
HIP 54672 |
30.03 |
| 2026-05-17 12:00 |
11:09:50.38 |
-08:20:50.9 |
HIP 54672 |
30.83 |
| 2026-05-18 00:00 |
11:09:51.79 |
-08:19:09.4 |
HIP 54672 |
31.64 |
| 2026-05-18 12:00 |
11:09:53.43 |
-08:17:29.4 |
HIP 54672 |
32.47 |
| 2026-05-19 00:00 |
11:09:55.31 |
-08:15:50.8 |
HIP 54672 |
33.31 |
| 2026-05-19 12:00 |
11:09:57.41 |
-08:14:13.8 |
HIP 54672 |
34.15 |
| 2026-05-20 00:00 |
11:09:59.76 |
-08:12:38.3 |
HIP 54672 |
35.00 |
| 2026-05-20 12:00 |
11:10:02.33 |
-08:11:04.3 |
HIP 54672 |
35.86 |
| 2026-05-21 00:00 |
11:10:05.14 |
-08:09:31.8 |
HIP 54672 |
36.72 |
| 2026-05-21 12:00 |
11:10:08.17 |
-08:08:00.9 |
HIP 54672 |
37.59 |
| 2026-05-22 00:00 |
11:10:11.44 |
-08:06:31.5 |
HIP 54672 |
38.46 |
| 2026-05-22 12:00 |
11:10:14.93 |
-08:05:03.6 |
HIP 54672 |
39.34 |
| 2026-05-23 00:00 |
11:10:18.65 |
-08:03:37.2 |
HIP 54672 |
40.22 |
| 2026-05-23 12:00 |
11:10:22.60 |
-08:02:12.4 |
HIP 54582 |
38.93 |
| 2026-05-24 00:00 |
11:10:26.77 |
-08:00:49.2 |
HIP 54582 |
37.62 |
| 2026-05-24 12:00 |
11:10:31.17 |
-07:59:27.4 |
HIP 54582 |
36.38 |
| 2026-05-25 00:00 |
11:10:35.79 |
-07:58:07.2 |
HIP 54582 |
35.22 |
| 2026-05-25 12:00 |
11:10:40.64 |
-07:56:48.6 |
HIP 54582 |
34.14 |
| 2026-05-26 00:00 |
11:10:45.70 |
-07:55:31.5 |
HIP 54582 |
33.16 |
| 2026-05-26 12:00 |
11:10:50.99 |
-07:54:16.0 |
HIP 54582 |
32.29 |
| 2026-05-27 00:00 |
11:10:56.49 |
-07:53:02.0 |
HIP 54582 |
31.55 |
| 2026-05-27 12:00 |
11:11:02.22 |
-07:51:49.5 |
HIP 54582 |
30.94 |
| 2026-05-28 00:00 |
11:11:08.16 |
-07:50:38.6 |
HIP 54582 |
30.48 |
| 2026-05-28 12:00 |
11:11:14.32 |
-07:49:29.3 |
HIP 54582 |
30.18 |
| 2026-05-29 00:00 |
11:11:20.69 |
-07:48:21.5 |
HIP 54582 |
30.06 |
| 2026-05-29 12:00 |
11:11:27.28 |
-07:47:15.3 |
HIP 54582 |
30.11 |
| 2026-05-30 00:00 |
11:11:34.08 |
-07:46:10.6 |
HIP 54582 |
30.34 |
| 2026-05-30 12:00 |
11:11:41.09 |
-07:45:07.4 |
HIP 54582 |
30.76 |
| 2026-05-31 00:00 |
11:11:48.31 |
-07:44:05.8 |
HIP 54582 |
31.36 |
| 2026-05-31 12:00 |
11:11:55.75 |
-07:43:05.8 |
HIP 54791 |
31.97 |
| 2026-06-01 00:00 |
11:12:03.39 |
-07:42:07.3 |
HIP 54791 |
30.18 |
| 2026-06-01 12:00 |
11:12:11.24 |
-07:41:10.3 |
HIP 54791 |
28.44 |
| 2026-06-02 00:00 |
11:12:19.30 |
-07:40:14.9 |
HIP 54791 |
26.77 |