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) |
| 2026-09-20 00:00 |
09:48:36.28 |
-74:59:58.8 |
HIP 48149 |
9.84 |
| 2026-09-20 12:00 |
09:48:56.29 |
-75:00:42.3 |
HIP 48149 |
10.50 |
| 2026-09-21 00:00 |
09:49:16.23 |
-75:01:26.3 |
HIP 48149 |
11.31 |
| 2026-09-21 12:00 |
09:49:36.08 |
-75:02:10.8 |
HIP 48149 |
12.27 |
| 2026-09-22 00:00 |
09:49:55.85 |
-75:02:55.8 |
HIP 48149 |
13.32 |
| 2026-09-22 12:00 |
09:50:15.54 |
-75:03:41.4 |
HIP 48149 |
14.46 |
| 2026-09-23 00:00 |
09:50:35.14 |
-75:04:27.5 |
HIP 48149 |
15.67 |
| 2026-09-23 12:00 |
09:50:54.66 |
-75:05:14.1 |
HIP 48149 |
16.92 |
| 2026-09-24 00:00 |
09:51:14.09 |
-75:06:01.2 |
HIP 48149 |
18.21 |
| 2026-09-24 12:00 |
09:51:33.43 |
-75:06:48.8 |
HIP 48530 |
18.24 |
| 2026-09-25 00:00 |
09:51:52.69 |
-75:07:36.9 |
HIP 48530 |
16.96 |
| 2026-09-25 12:00 |
09:52:11.86 |
-75:08:25.5 |
HIP 48530 |
15.71 |
| 2026-09-26 00:00 |
09:52:30.94 |
-75:09:14.6 |
HIP 48530 |
14.50 |
| 2026-09-26 12:00 |
09:52:49.93 |
-75:10:04.3 |
HIP 48530 |
13.32 |
| 2026-09-27 00:00 |
09:53:08.83 |
-75:10:54.4 |
HIP 48530 |
12.21 |
| 2026-09-27 12:00 |
09:53:27.64 |
-75:11:45.0 |
HIP 48530 |
11.17 |
| 2026-09-28 00:00 |
09:53:46.35 |
-75:12:36.1 |
HIP 48530 |
10.22 |
| 2026-09-28 12:00 |
09:54:04.98 |
-75:13:27.7 |
HIP 48530 |
9.40 |
| 2026-09-29 00:00 |
09:54:23.51 |
-75:14:19.8 |
HIP 48530 |
8.74 |
| 2026-09-29 12:00 |
09:54:41.94 |
-75:15:12.3 |
HIP 48530 |
8.28 |
| 2026-09-30 00:00 |
09:55:00.28 |
-75:16:05.4 |
HIP 48530 |
8.05 |
| 2026-09-30 12:00 |
09:55:18.53 |
-75:16:58.9 |
HIP 48530 |
8.06 |
| 2026-10-01 00:00 |
09:55:36.67 |
-75:17:52.9 |
HIP 48530 |
8.33 |
| 2026-10-01 12:00 |
09:55:54.72 |
-75:18:47.4 |
HIP 48530 |
8.82 |
| 2026-10-02 00:00 |
09:56:12.67 |
-75:19:42.4 |
HIP 48530 |
9.50 |
| 2026-10-02 12:00 |
09:56:30.52 |
-75:20:37.8 |
HIP 48530 |
10.33 |
| 2026-10-03 00:00 |
09:56:48.27 |
-75:21:33.7 |
HIP 48530 |
11.28 |
| 2026-10-03 12:00 |
09:57:05.91 |
-75:22:30.1 |
HIP 48530 |
12.32 |
| 2026-10-04 00:00 |
09:57:23.46 |
-75:23:26.9 |
HIP 48530 |
13.43 |
| 2026-10-04 12:00 |
09:57:40.89 |
-75:24:24.2 |
HIP 48530 |
14.60 |
| 2026-10-05 00:00 |
09:57:58.22 |
-75:25:22.0 |
HIP 49139 |
14.13 |
| 2026-10-05 12:00 |
09:58:15.45 |
-75:26:20.2 |
HIP 49139 |
13.07 |
| 2026-10-06 00:00 |
09:58:32.57 |
-75:27:18.8 |
HIP 49139 |
12.10 |
| 2026-10-06 12:00 |
09:58:49.58 |
-75:28:17.9 |
HIP 49139 |
11.25 |
| 2026-10-07 00:00 |
09:59:06.48 |
-75:29:17.5 |
HIP 49139 |
10.54 |
| 2026-10-07 12:00 |
09:59:23.26 |
-75:30:17.5 |
HIP 49139 |
10.01 |
| 2026-10-08 00:00 |
09:59:39.94 |
-75:31:17.9 |
HIP 49139 |
9.68 |
| 2026-10-08 12:00 |
09:59:56.50 |
-75:32:18.8 |
HIP 49139 |
9.57 |
| 2026-10-09 00:00 |
10:00:12.95 |
-75:33:20.1 |
HIP 49139 |
9.70 |
| 2026-10-09 12:00 |
10:00:29.28 |
-75:34:21.9 |
HIP 49139 |
10.04 |
| 2026-10-10 00:00 |
10:00:45.50 |
-75:35:24.0 |
HIP 49139 |
10.59 |
| 2026-10-10 12:00 |
10:01:01.60 |
-75:36:26.6 |
HIP 49139 |
11.30 |
| 2026-10-11 00:00 |
10:01:17.58 |
-75:37:29.6 |
HIP 49139 |
12.16 |