메타데이터
| 항목 |
값 |
| Designation |
C/2019 K4 (Ye) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-16T10:03:46.733760Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:41Z |
| Obs used |
609 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
8.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-05-30T11:03:04.003200Z |
| Discovery magnitude (MPC) |
17.14 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-08-25.0000000 |
| e |
0.99906130 |
| q (au) |
2.259417 |
| a (au) |
2406.958686 |
| i (deg) |
105.305274 |
| Ω (om, deg) |
180.165129 |
| ω (w, deg) |
139.772154 |
| M (ma, deg) |
0.000581 |
밝기
산란 + 전체 선형
$$
M_a = (10.560 + 5.292\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.560 |
| n |
5.292 |
| gf |
0.999 |
| gb |
-0.735 |
| k |
0.992 |
| 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) |
| 2026-03-26 00:00 |
08:11:50.00 |
-80:02:57.2 |
HIP 40034 |
32.34 |
| 2026-03-26 12:00 |
08:11:37.79 |
-80:01:24.6 |
HIP 39255 |
33.35 |
| 2026-03-27 00:00 |
08:11:25.93 |
-79:59:51.6 |
HIP 39255 |
32.02 |
| 2026-03-27 12:00 |
08:11:14.43 |
-79:58:18.2 |
HIP 39255 |
30.73 |
| 2026-03-28 00:00 |
08:11:03.27 |
-79:56:44.4 |
HIP 39255 |
29.49 |
| 2026-03-28 12:00 |
08:10:52.46 |
-79:55:10.2 |
HIP 39255 |
28.29 |
| 2026-03-29 00:00 |
08:10:42.00 |
-79:53:35.7 |
HIP 39255 |
27.15 |
| 2026-03-29 12:00 |
08:10:31.88 |
-79:52:00.8 |
HIP 39255 |
26.07 |
| 2026-03-30 00:00 |
08:10:22.11 |
-79:50:25.5 |
HIP 39255 |
25.06 |
| 2026-03-30 12:00 |
08:10:12.68 |
-79:48:49.9 |
HIP 39255 |
24.13 |
| 2026-03-31 00:00 |
08:10:03.58 |
-79:47:14.0 |
HIP 39255 |
23.29 |
| 2026-03-31 12:00 |
08:09:54.83 |
-79:45:37.8 |
HIP 39255 |
22.55 |
| 2026-04-01 00:00 |
08:09:46.41 |
-79:44:01.2 |
HIP 39255 |
21.93 |
| 2026-04-01 12:00 |
08:09:38.33 |
-79:42:24.3 |
HIP 39255 |
21.43 |
| 2026-04-02 00:00 |
08:09:30.58 |
-79:40:47.1 |
HIP 39255 |
21.06 |
| 2026-04-02 12:00 |
08:09:23.17 |
-79:39:09.6 |
HIP 39255 |
20.82 |
| 2026-04-03 00:00 |
08:09:16.08 |
-79:37:31.8 |
HIP 39255 |
20.74 |
| 2026-04-03 12:00 |
08:09:09.32 |
-79:35:53.8 |
HIP 39255 |
20.80 |
| 2026-04-04 00:00 |
08:09:02.89 |
-79:34:15.5 |
HIP 39255 |
21.00 |
| 2026-04-04 12:00 |
08:08:56.79 |
-79:32:36.9 |
HIP 39255 |
21.35 |
| 2026-04-05 00:00 |
08:08:51.00 |
-79:30:58.1 |
HIP 40415 |
20.74 |
| 2026-04-05 12:00 |
08:08:45.54 |
-79:29:19.0 |
HIP 40415 |
20.07 |
| 2026-04-06 00:00 |
08:08:40.40 |
-79:27:39.6 |
HIP 40415 |
19.52 |
| 2026-04-06 12:00 |
08:08:35.57 |
-79:26:00.1 |
HIP 40415 |
19.08 |
| 2026-04-07 00:00 |
08:08:31.06 |
-79:24:20.3 |
HIP 40415 |
18.77 |
| 2026-04-07 12:00 |
08:08:26.87 |
-79:22:40.3 |
HIP 40415 |
18.59 |
| 2026-04-08 00:00 |
08:08:22.99 |
-79:21:00.1 |
HIP 40415 |
18.55 |
| 2026-04-08 12:00 |
08:08:19.41 |
-79:19:19.7 |
HIP 40415 |
18.64 |
| 2026-04-09 00:00 |
08:08:16.15 |
-79:17:39.1 |
HIP 40415 |
18.87 |
| 2026-04-09 12:00 |
08:08:13.19 |
-79:15:58.3 |
HIP 40415 |
19.24 |
| 2026-04-10 00:00 |
08:08:10.54 |
-79:14:17.3 |
HIP 40415 |
19.73 |
| 2026-04-10 12:00 |
08:08:08.20 |
-79:12:36.2 |
HIP 40415 |
20.33 |
| 2026-04-11 00:00 |
08:08:06.15 |
-79:10:54.9 |
HIP 39173 |
20.82 |
| 2026-04-11 12:00 |
08:08:04.40 |
-79:09:13.5 |
HIP 39173 |
20.71 |
| 2026-04-12 00:00 |
08:08:02.95 |
-79:07:31.9 |
HIP 39173 |
20.76 |
| 2026-04-12 12:00 |
08:08:01.80 |
-79:05:50.1 |
HIP 39173 |
20.96 |
| 2026-04-13 00:00 |
08:08:00.94 |
-79:04:08.3 |
HIP 39173 |
21.30 |
| 2026-04-13 12:00 |
08:08:00.38 |
-79:02:26.3 |
HIP 39818 |
20.75 |
| 2026-04-14 00:00 |
08:08:00.10 |
-79:00:44.1 |
HIP 39818 |
19.05 |
| 2026-04-14 12:00 |
08:08:00.11 |
-78:59:01.9 |
HIP 39818 |
17.35 |
| 2026-04-15 00:00 |
08:08:00.41 |
-78:57:19.6 |
HIP 39818 |
15.64 |
| 2026-04-15 12:00 |
08:08:00.99 |
-78:55:37.2 |
HIP 39818 |
13.93 |
| 2026-04-16 00:00 |
08:08:01.86 |
-78:53:54.7 |
HIP 39818 |
12.23 |