C/2017 M4 (ATLAS)
메타데이터
| 항목 |
값 |
| Designation |
C/2017 M4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-01-18T08:09:45.547200Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:42:28Z |
| Obs used |
3296 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
6.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-06-17.0000000 |
| e |
1.00108487 |
| q (au) |
3.251701 |
| a (au) |
-2997.319774 |
| i (deg) |
105.657087 |
| Ω (om, deg) |
65.868353 |
| ω (w, deg) |
167.652626 |
| M (ma, deg) |
-0.001293 |
밝기
산란 + 전체 선형
$$
M_a = (7.294 + 2.998\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.294 |
| n |
2.998 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
05:58:33.97 |
-37:31:40.8 |
HIP 28430 |
20.64 |
| 2026-02-03 12:00 |
05:58:27.32 |
-37:30:25.4 |
HIP 28430 |
22.26 |
| 2026-02-04 00:00 |
05:58:20.73 |
-37:29:09.5 |
HIP 28430 |
23.90 |
| 2026-02-04 12:00 |
05:58:14.20 |
-37:27:53.1 |
HIP 28193 |
24.71 |
| 2026-02-05 00:00 |
05:58:07.73 |
-37:26:36.1 |
HIP 28193 |
25.49 |
| 2026-02-05 12:00 |
05:58:01.33 |
-37:25:18.7 |
HIP 28193 |
26.39 |
| 2026-02-06 00:00 |
05:57:54.98 |
-37:24:00.7 |
HIP 28310 |
27.23 |
| 2026-02-06 12:00 |
05:57:48.70 |
-37:22:42.2 |
HIP 28310 |
26.67 |
| 2026-02-07 00:00 |
05:57:42.48 |
-37:21:23.3 |
HIP 28310 |
26.22 |
| 2026-02-07 12:00 |
05:57:36.32 |
-37:20:03.8 |
HIP 28310 |
25.86 |
| 2026-02-08 00:00 |
05:57:30.23 |
-37:18:43.9 |
HIP 28310 |
25.62 |
| 2026-02-08 12:00 |
05:57:24.20 |
-37:17:23.5 |
HIP 28010 |
24.92 |
| 2026-02-09 00:00 |
05:57:18.23 |
-37:16:02.6 |
HIP 28010 |
23.30 |
| 2026-02-09 12:00 |
05:57:12.33 |
-37:14:41.3 |
HIP 28010 |
21.72 |
| 2026-02-10 00:00 |
05:57:06.50 |
-37:13:19.5 |
HIP 28010 |
20.19 |
| 2026-02-10 12:00 |
05:57:00.73 |
-37:11:57.3 |
HIP 28010 |
18.70 |
| 2026-02-11 00:00 |
05:56:55.02 |
-37:10:34.6 |
HIP 28010 |
17.29 |
| 2026-02-11 12:00 |
05:56:49.38 |
-37:09:11.5 |
HIP 28010 |
15.96 |
| 2026-02-12 00:00 |
05:56:43.81 |
-37:07:48.0 |
HIP 28010 |
14.75 |
| 2026-02-12 12:00 |
05:56:38.30 |
-37:06:24.0 |
HIP 28010 |
13.66 |
| 2026-02-13 00:00 |
05:56:32.86 |
-37:04:59.7 |
HIP 28010 |
12.76 |
| 2026-02-13 12:00 |
05:56:27.49 |
-37:03:34.9 |
HIP 28010 |
12.05 |
| 2026-02-14 00:00 |
05:56:22.19 |
-37:02:09.7 |
HIP 28010 |
11.60 |
| 2026-02-14 12:00 |
05:56:16.95 |
-37:00:44.2 |
HIP 28010 |
11.42 |
| 2026-02-15 00:00 |
05:56:11.78 |
-36:59:18.2 |
HIP 28010 |
11.52 |
| 2026-02-15 12:00 |
05:56:06.68 |
-36:57:51.9 |
HIP 28010 |
11.91 |
| 2026-02-16 00:00 |
05:56:01.65 |
-36:56:25.2 |
HIP 28010 |
12.54 |
| 2026-02-16 12:00 |
05:55:56.69 |
-36:54:58.1 |
HIP 28010 |
13.38 |
| 2026-02-17 00:00 |
05:55:51.80 |
-36:53:30.7 |
HIP 28010 |
14.41 |
| 2026-02-17 12:00 |
05:55:46.98 |
-36:52:02.9 |
HIP 28010 |
15.57 |
| 2026-02-18 00:00 |
05:55:42.22 |
-36:50:34.8 |
HIP 28010 |
16.84 |
| 2026-02-18 12:00 |
05:55:37.54 |
-36:49:06.3 |
HIP 28010 |
18.20 |
| 2026-02-19 00:00 |
05:55:32.93 |
-36:47:37.5 |
HIP 28010 |
19.62 |
| 2026-02-19 12:00 |
05:55:28.38 |
-36:46:08.4 |
HIP 28010 |
21.10 |
| 2026-02-20 00:00 |
05:55:23.91 |
-36:44:39.0 |
HIP 28010 |
22.62 |
| 2026-02-20 12:00 |
05:55:19.51 |
-36:43:09.3 |
HIP 28010 |
24.17 |
| 2026-02-21 00:00 |
05:55:15.18 |
-36:41:39.3 |
HIP 28010 |
25.75 |
| 2026-02-21 12:00 |
05:55:10.92 |
-36:40:09.0 |
HIP 28010 |
27.35 |
| 2026-02-22 00:00 |
05:55:06.73 |
-36:38:38.4 |
HIP 28136 |
26.99 |
| 2026-02-22 12:00 |
05:55:02.62 |
-36:37:07.5 |
HIP 28136 |
26.69 |
| 2026-02-23 00:00 |
05:54:58.57 |
-36:35:36.4 |
HIP 28136 |
26.49 |
| 2026-02-23 12:00 |
05:54:54.60 |
-36:34:05.0 |
HIP 28136 |
26.38 |
| 2026-02-24 00:00 |
05:54:50.70 |
-36:32:33.4 |
HIP 27823 |
25.48 |