메타데이터
| 항목 |
값 |
| Designation |
C/2019 K8 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-07-21T05:16:17.423040Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:43:00Z |
| Obs used |
1385 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
17.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-05-27T13:35:12.768000Z |
| Discovery magnitude (MPC) |
17.94 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-07-10.0000000 |
| e |
0.99773063 |
| q (au) |
3.195048 |
| a (au) |
1407.899123 |
| i (deg) |
93.222155 |
| Ω (om, deg) |
291.046375 |
| ω (w, deg) |
85.352840 |
| M (ma, deg) |
359.999791 |
밝기
산란 + 전체 선형
$$
M_a = (11.128 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.128 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-07-21 |
2020-05-19 |
+17.4834 |
-9.014 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:52:33.15 |
-11:05:54.8 |
HIP 32971 |
9.86 |
| 2026-05-12 12:00 |
06:52:37.14 |
-11:05:31.2 |
HIP 32971 |
10.87 |
| 2026-05-13 00:00 |
06:52:41.16 |
-11:05:07.9 |
HIP 32971 |
11.89 |
| 2026-05-13 12:00 |
06:52:45.23 |
-11:04:45.0 |
HIP 33075 |
11.83 |
| 2026-05-14 00:00 |
06:52:49.33 |
-11:04:22.4 |
HIP 33075 |
11.48 |
| 2026-05-14 12:00 |
06:52:53.47 |
-11:04:00.2 |
HIP 33075 |
11.22 |
| 2026-05-15 00:00 |
06:52:57.65 |
-11:03:38.4 |
HIP 33075 |
11.04 |
| 2026-05-15 12:00 |
06:53:01.87 |
-11:03:16.9 |
HIP 33075 |
10.95 |
| 2026-05-16 00:00 |
06:53:06.13 |
-11:02:55.9 |
HIP 33075 |
10.97 |
| 2026-05-16 12:00 |
06:53:10.42 |
-11:02:35.2 |
HIP 33075 |
11.09 |
| 2026-05-17 00:00 |
06:53:14.75 |
-11:02:14.8 |
HIP 33075 |
11.32 |
| 2026-05-17 12:00 |
06:53:19.12 |
-11:01:54.9 |
HIP 33075 |
11.63 |
| 2026-05-18 00:00 |
06:53:23.52 |
-11:01:35.3 |
HIP 33075 |
12.04 |
| 2026-05-18 12:00 |
06:53:27.96 |
-11:01:16.2 |
HIP 33075 |
12.54 |
| 2026-05-19 00:00 |
06:53:32.44 |
-11:00:57.4 |
HIP 33075 |
13.11 |
| 2026-05-19 12:00 |
06:53:36.95 |
-11:00:38.9 |
HIP 33075 |
13.75 |
| 2026-05-20 00:00 |
06:53:41.49 |
-11:00:20.9 |
HIP 33075 |
14.44 |
| 2026-05-20 12:00 |
06:53:46.07 |
-11:00:03.3 |
HIP 33075 |
15.20 |
| 2026-05-21 00:00 |
06:53:50.69 |
-10:59:46.0 |
HIP 33075 |
16.00 |
| 2026-05-21 12:00 |
06:53:55.33 |
-10:59:29.2 |
HIP 33112 |
16.44 |
| 2026-05-22 00:00 |
06:54:00.01 |
-10:59:12.7 |
HIP 33112 |
16.88 |
| 2026-05-22 12:00 |
06:54:04.73 |
-10:58:56.7 |
HIP 33112 |
17.38 |
| 2026-05-23 00:00 |
06:54:09.47 |
-10:58:41.0 |
HIP 33112 |
17.95 |
| 2026-05-23 12:00 |
06:54:14.25 |
-10:58:25.7 |
HIP 33112 |
18.57 |
| 2026-05-24 00:00 |
06:54:19.06 |
-10:58:10.9 |
HIP 33112 |
19.24 |
| 2026-05-24 12:00 |
06:54:23.90 |
-10:57:56.4 |
HIP 33112 |
19.97 |
| 2026-05-25 00:00 |
06:54:28.77 |
-10:57:42.3 |
HIP 33112 |
20.73 |
| 2026-05-25 12:00 |
06:54:33.67 |
-10:57:28.6 |
HIP 33112 |
21.53 |
| 2026-05-26 00:00 |
06:54:38.60 |
-10:57:15.3 |
HIP 33112 |
22.38 |
| 2026-05-26 12:00 |
06:54:43.56 |
-10:57:02.5 |
HIP 33112 |
23.25 |
| 2026-05-27 00:00 |
06:54:48.55 |
-10:56:50.0 |
HIP 33112 |
24.15 |
| 2026-05-27 12:00 |
06:54:53.57 |
-10:56:37.9 |
HIP 33112 |
25.09 |
| 2026-05-28 00:00 |
06:54:58.61 |
-10:56:26.3 |
HIP 33112 |
26.05 |
| 2026-05-28 12:00 |
06:55:03.69 |
-10:56:15.0 |
HIP 33112 |
27.03 |
| 2026-05-29 00:00 |
06:55:08.79 |
-10:56:04.1 |
HIP 33112 |
28.04 |
| 2026-05-29 12:00 |
06:55:13.92 |
-10:55:53.7 |
HIP 33112 |
29.06 |
| 2026-05-30 00:00 |
06:55:19.08 |
-10:55:43.6 |
HIP 33436 |
27.79 |
| 2026-05-30 12:00 |
06:55:24.27 |
-10:55:34.0 |
HIP 33436 |
26.52 |
| 2026-05-31 00:00 |
06:55:29.48 |
-10:55:24.8 |
HIP 33436 |
25.24 |
| 2026-05-31 12:00 |
06:55:34.72 |
-10:55:16.0 |
HIP 33436 |
23.95 |
| 2026-06-01 00:00 |
06:55:39.98 |
-10:55:07.6 |
HIP 33436 |
22.67 |
| 2026-06-01 12:00 |
06:55:45.27 |
-10:54:59.6 |
HIP 33436 |
21.38 |
| 2026-06-02 00:00 |
06:55:50.58 |
-10:54:52.0 |
HIP 33436 |
20.09 |